Comsol multiple study steps

Comsol multiple study steps. With all the discussed adjustments, we can now run the multimaterial optimization study by computing Study 3. I also created a parametric sweep. in COMSOL v4 you have two types of parametric sweep, the "inner" one is the solver continuation sweep, this does NOT pass via the geometry, hence no geometrical nor mesh updates. If the above can be achieved, all steps can be run in one go during the same study. Create the mesh. In this video, we provide a comprehensive overview of adding a study to your model, including how to choose and add studies, edit the study settings for multiple study types (using a thermal bracket tutorial model), and use the different parts of the COMSOL Desktop ® that provide information as your model is computing. Jan 24, 2014 · But the combination of the results still seems to be tricky. An example model that combines the techniques of nonlinearity ramping and adaptive mesh refinement with multiple study steps is the Cooling and Solidification of Metal tutorial model, which was highlighted earlier in this article. 0 1 Reply. Specifying an objective function. Learn how to postprocess your sweep in our follow up tutorial video, Postprocessing the Results from a Parametric Sweep. Specify material properties. sin (2. Some nodes can also be duplicated underneath the original node. Click Update Solution () or press F5 (when applicable) to update the current study. And then the true "parametric sweep" (right click on the solver node add a Procedure. Is there a way to The Relationship Between Study Steps and Solver Configurations. . In the second solver, however, under the "Values of Dependent Variables", go to "Variables not solved for" and change the method to Solution. The same thing happens in the third step too. Study steps, which determine overall settings suitable for a certain study type. Results While Solving. EDT Microfluidics, Results & Visualization, Studies & Solvers 1 Reply. In study 2, I am disabling "Variables 1" and "State Copying, Pasting, and Duplicating Nodes. The software plots the dataset of the selected A one-way coupled approach using a single study. AC/DC-Module->Electric currents->Transient Study. Define physics boundary conditions. g. In heat transfer, it is used to compute temperature changes over time. The plot uses the accumulated number of iterations. These nodes are divided into three broad categories: •. •. The main advantage of using multiple study steps is that initial conditions are automatically taken from the preceding step. Which means that the variables should not be solved for in the second step. case #2 (target) : two harmonic load at once, with respectively freqs 9Hz and 11Hz. Some studies require add-on modules, and these are listed in Table 20-3 (in that list, the submenu under Study Steps in the Study branches appears in parentheses for the study types that are available as individual study steps). The Stationary () study and study step are used when field variables do not change over time, such as in stationary problems. 2017, 06:02 UTC−5 Structural & Acoustics, Studies & Solvers Version 5. Running the simulation. Send Private Message Flag post as spam. normB)_ (second parameter combination)+ + abs (mf. Can anyone point out the logic behind this change affecting the convergence of the solution. , a prepared forward model) Adding an optimization study. It is also possible to solve the Mar 26, 2024 · In a study with multiple steps, I hope to solve different physics or different governing equations, i. Jun 10, 2018 · Hi, If the studies are not really connected to each other, I would suggest using two different studies, rather than study steps. The Time Dependent, One-Way Coupled () study is used for time-dependent fluid-structure interaction computations where the model is one-way coupled in the sense that the structural deformations are so small that they do not affect the flow. The Study Steps Settings Windows’ Toolbar. Building the geometry. Posted: 7 years ago. It is also easier to run the whole sequence at one go. Use the Study Sequence node () to define such predefined study sequences. Then select what to plot from the Plot group list and, for time-dependent simulations, at which time steps to update the plot: the output times or the time steps taken by the solver. It is also possible to solve the Aug 30, 2023 · Multi-Step Studies. I am implementing a two study scheme, where in study 1, I run the physics while computing X and Y. 0 1 Reply Khaled Harmouch In product development, it is often necessary to solve several variations of a model to find its design's optimal properties. We outline the steps that we will use to add an optimization study to a model as well as how to set up the Optimization study step. Learn about the implications of finalizing a model geometry and learn how to do so. pi. I wish to have the parametric sweep be performed on both steps (that are independent), however I only receive one parametric solution for one study step. I need to apply a sinusoidal exictation force (Fex=F0. The reson I want to have separate study steps is that meshing required for the lower wavelengths Studies and Study Steps. The second study step will automatically use the results from the first step. Nov 16, 2017 · Multiple study steps : Stationary and Time dependent. There's a way to save time when Select the Store solution for all intermediate study steps check box (cleared by default) to make the study add Solution Store nodes after all intermediate study steps in a study with multiple study steps. Solve-For State Icons. Similarly on the third one. So far, my attempts have failed. , in order to meet an objective, such as the performance of a design, the need to fall under a specific criteria, etc. For the second option, "Values of variables not solved for," you want the following settings: Keep in mind that this will be very fast, but will not adjust the flow based on the heat transfer. Just check "Modify physics tree and variables for study step" in the Study Settings node and disable/enable appropriate boundary conditions in your stationary and time-dependentent studies. Jul 16, 2020 · One of the common uses of COMSOL Multiphysics with the AC/DC Module and Heat Transfer Module is for modeling inductive heating, the process by which a coil is used to heat up a workpiece over time. When using the parametric solver, the graphs for the different parameter steps are merged, and the convergence plots use the accumulated number of iterations. Adding a study to your simulation is necessary in order to solve your problem. But, in the second step , the solver starts working on undeformed geometry with the new boundary conditions. In a nutshell I want to run frequency domain analysis in these two cases: case #1 (already possible): one harmonic load through freqs [1,10,100] Hz. Changing the mesh refinement. Apr 14, 2011 · Im hoping to run a 2D structural mechanics contact simulation composed of two steps. 0 1 Reply I am running amodel in which I have three study steps. normB)_ (last parameter May 10, 2017 · The Combine Solutions study step makes it possible to concatenate two solutions created in other study steps in the model. I've tried duplicating the data set but whenever I run the simulation for the second time both solution sets contain the same results corresponding to the second simulation. Defining physics boundary conditions. Ramp this parameter via the Auxilliary sweep option within the Stationary study step The modeling workflow consists of the following steps: Setting up the model environment. In this 10-part course, you will get an introduction to optimization, learn how to perform multiple types of optimization using the COMSOL Multiphysics ® software and the Optimization Module add-on, and, in the process, learn about the benefits of combining multiphysics simulation with optimization. Build the geometry. When you use separate studies, you have to use more settings in the main Study node to point to the results in the preceding study. From there, we move on to a new example that performs topology optimization of a bracket. This is achieved through a series of iterations where specific design aspects are varied, such as the dimensions, material properties, operating conditions, etc. What's the best route to do this? Thanks! Absolutely right to not respond to this. First introduce a Global Parameter that multiplies all displacements, loads, and stiffnesses, such as RampFactor. In electromagnetics, it is used to compute static electric or magnetic fields, as well as direct currents. Mar 30, 2018 · Optimizing a Tuning Fork for Various Materials in COMSOL Multiphysics. To select individual physics nodes and variables and other model settings, select the Modify model configuration for study step check box (see Modifying the Model Configuration below). I have a study (acoustics simulation, solving in the frequency domain) and two study steps. Features include the 2D Table Surface plot type, tables, and exporting the data to other programs. Results->Data Sets->Add to Export->Output->Points to evaluate in->Grid. As this mesh is refined, the solution will tend to A study sequence is a sequence of study steps that a user can choose in the last step of the Model Wizard. 2 using structural mech). (1) multiple studies Study 1: Bolt pretension Study 2: Heat transfer in solid-Thermal expansion Study 3: Service load. The instances are launched as external batch jobs from a Batch Sweep study run in the GUI. 1: 6 THz. Be sure you sweep through a wide enough range of maximum mesh sizes so you can fully capture the convergence effect in your analysis. Learn how to model two-phase flow using the level set and phase field approaches. Jul 28, 2014 · The heat transfer coefficient is parameterized from 5 W/(m 2 K) to 20 W/(m 2 K) with steps of 3 W/(m 2 K), while the mesh is parameterized in the same way as the previous case. In the COMSOL Desktop, you create one or more studies, each with one or more study steps to compute the solution to a model. C is obviously a spatio-temporal variable and at each time step the total value of C across the domain would be C_total. Using Multiple Steps A single study can include multiple study steps. Workpiece being inductively heated over time, with nonlinear material properties. May 10, 2017 · The Combine Solutions study step makes it possible to concatenate two solutions created in other study steps in the model. The Batch Sweep — in contrast to the Parametric Sweep — is using multiple COMSOL batch instances to process the parameter cases. I am trying to run an optimization on my optical structure, where my objective function is calculated from separate study steps each for an interval in the wavelength domain. 1 :0. Thesecond step is an eigenvalue step should take the potential from the stationary step and compute eigenvalues. Hello, I'm attempting to run a multi step time dependent study where the second step picks up at the end of the first step. A one-way coupled approach using a single study. In the first solver, you'd solve for one physics, in the second solver you'd solve for the second physics. EST Structural & Acoustics, Studies & Solvers Version 5. One alternative is to use several studies, such as for Study 1 you calculate from 0s-100s, then Study 2 from 100s-1000s. On top of the study steps Settings windows, a toolbar contains the following commands: •. When the Specified values option is used (the default) the software will write Feb 3, 2016 · I'm trying to do something like a parametric study but instead of doing a parametric study I want to run a transient simulation multiple times and store the solution in different study/solution data sets. In the Settings window go to Values of Dependent Variables. The leftmost column shows an icon that represent the state of the corresponding physics interface Feb 19, 2011 · The first variable is the incident field wave length and second is angle of incidence. Resolving mesh sensitivity. e. Study Settings. In the COMSOL Multiphysics ® software, there is a large selection of predefined study types that you can use to perform various analyses in a model. In the COMSOL Multiphysics® software, this step of the modeling workflow is ma Apr 20, 2011 · When the Dependent Variable in solver settings was set to "defined by study step- step 1:stationary", the solution was not converging. Study. Solver Configurations. PDT. This study controls the material assignment and runs individual optimization procedures for each by starting Study 2 automatically. Mar 17, 2017 · The third step is a different eigenvalue step which should again tae he potentials from the first step and compute a new set of eigenvlues. This set should only generate a single result. If a repeating pulsed load is applied, use two explicit events, one to trigger at the turn-on time, and the other to trigger at the turn-off time. First, this mesh is used to approximate the CAD geometry. Postprocessing the results. Then I defined above mentioned frequency A parametric sweep allows you to change the parameter values through a specified range. I need to do both studies in order to evaluate my objective function. To be more specific I want to sum the expression "abs (mf. The problem is that the output only has a single variable named "lambda" which lumps all the eigenvalues for both steps into one array. 025,5) and for Step 2 set as: range (5,0 Nov 16, 2017 · Multiple study steps : Stationary and Time dependent. If this check box is not selected, Solution Store nodes are only added for some study step combinations. You will also learn how to perform parameter Multiple study steps : Stationary and Time dependent Posted 16 nov 2017, 06:02 GMT-5 Structural & Acoustics, Studies & Solvers Version 5. In each study you have only one step, and in study 2 you can specify the initial value to be the 100s step result from If you want to output the results at the exact timesteps taken by the solver, go to the Time-Dependent Solver settings, Output section, and set the Times to store: to Steps taken by solver, as shown below. In this tutorial video, we will teach you how to implement a parametric sweep with the COMSOL software. When solving a Stationary study, you will want to ramp up the prescribed displacements, loads, or spring foundations on unconstrained domains. Follow along with this tutorial as we guide you through the entire model building process and provide you with a detailed overview of the modeling workflow, which consists of the following steps: Set up the model environment. The model has two steps; the first is a tension applied to the end of a rod the second is a shear applied at the top of the rod I know what you could model this as a single step, but I am trying to get a handle of how Comsol works so have split it into two steps. Hello Asad, In the Model Builder, Right-click on the Study node, select Study Steps and then the type of step you want to add. Optimization is the mathematical process of finding the optimal version of a design or process. • Aug 6, 2013 · Next, right-click your Study node and add a Parametric Sweep. Jun 14, 2012 · The purpose is to deform the geometry in first step with certain Bc's and apply another loading/boundary conditions on the deformed geometry in the second step. Posted Aug 30, 2023, 4:26 p. 2/ store the former mf solution. For example, in electromagnetics, it is used to compute transient electromagnetic fields, including electromagnetic wave propagation in the time domain. Extracting the optimized design for validation. In the Settings window, add your dummy mesh size parameter to the Parameter names list and enter the range of values to sweep your parameter over. By default, you can select from the participating physics interfaces and moving frames. It is possible to copy and paste many of the nodes in the Model Builder to create additional nodes with identical settings or to paste it into another model. The first step is a stationary step which solves for a poptential profile to be used in the eigenvalue step. 01 : 4 THz and 2) 4. Creating the mesh. Multiply one, some, or all of the applied loads by the continuation parameter. In summary, the procedure for implementing load ramping for your stationary nonlinear model is: Define a continuation parameter. See Updating a Solution. K is a function of C as K = K (C). Apr 19, 2019 · In the RF Module, an add-on to the COMSOL Multiphysics® software, high-frequency electromagnetics phenomena are addressed through several physics interfaces combined with different types of study steps. All study step Settings windows contain a Physics and Variables Selection section, which you can use to control which physics interfaces (or even specific variables and physics nodes) to solve for. Most studies and study steps correspond to part of a solver configuration that includes a solver for the specific problem, as listed in Table 20-1. Study Step. Click Compute () or press F8 to compute the entire study. 5 version this was easy to do in the solver manager by running these steps: 1/ solve for mf in time_harmonic. For example 1 up to 6 THz is converted to 1) 1 : 0. Then go to the view's camera node, probably located in Components 1 > Definitions > View 1 Jun 10, 2010 · In the former 3. You can use a 3D contour plot pointing to the parametric extrusion data set and use a view that is chosen such that all the 2D slices coincide: Click on "Go to XY View" in the graphics window's toolbar. Get an introduction to the Corrosion Module in COMSOL Multiphysics ®. Setting the Filter type to None to see the effect of filtering. Feb 17, 2014 · If you have figured it out, please let me know your solution, thanks! I am dealing with the same problem. in solid mechanics, in step 1 considering no inertial terms and in step 2 considering inertial terms. May 8, 2024 · In the second study step, I need to use the last computed value of the variable X in the physics and solve again. It is typically used in conjunction with a Discrete States feature that is used to modify a boundary condition. You can also specify a Period of event to model regularly repeating changes in load. Add an auxiliary sweep of the continuation parameter in the Stationary study step. 2 and going to solve the following equation. 2. Study 1 setting 1) Model configuration for study step Bolt pretension : Enable Heat transfer-thermal expansion : Disable Service load : Disable 2)Values of dependent variables Sep 22, 2016 · What you need is to go into Study 2/Step 1. But when I set the same to "defined by study step: user defined" the solution converges. As an alternative to the concatenation of solutions (time-dependent or parametric solutions, for example), it is also possible to use summations to combine solutions (such as creating a solution that is the sum of various Apr 21, 2021 · First: I prepared it as two study steps ( Step 1: Time Dependent A and Step 2: Time Dependent B) under the same overall Study. This study step follows a study step that computes the stationary (or bias) solution and computes a perturbed solution of the linearized problem around the linearization point (or bias point) computed in the first step. Select the Store solution for all intermediate study steps check box (cleared by default) to make the study add Solution Store nodes after all intermediate study steps in a study with multiple study steps. You will also learn how to perform parameter The main study step types — most of them available as a study in the Add Study window — are listed in Table 20-2. From there, you can choose the study type that enables you to solve your problem and thus answer your question. Oct 15, 2017, 3:24 a. Approach 1: Initializing Time-Dependent Studies with Stationary Studies The first approach you can use to solve a time-dependent model with inconsistent initial values is to initialize your transient study with a stationary study. in which t is time and the problem is one dimensional (x). That is, you can paste the node into a model in a new COMSOL Desktop session. I did this simply by right clicking on study and chose two different frequency domain studies. Oct 13, 2017 · Jeff Hiller. Instead of manually changing these property values and re-solving each time, you can perform a parametric sweep with COMSOL Multiphysics ®. t)). The study steps added are based on the chosen study types. freq. Feb 7, 2023 · 1) multiple studies 2) multiple steps. Time to Frequency FFT. By default, the In this video, we provide a comprehensive overview of adding a study to your model, including how to choose and add studies, edit the study settings for multiple study types (using a thermal bracket tutorial model), and use the different parts of the COMSOL Desktop ® that provide information as your model is computing. Best, Jeff. Then you add a third study of the type 'Empty study' and add two 'Study Reference' steps. Posted Nov 16, 2017, 6:02 a. Jun 21, 2016 · Export 3D-Grid data for multiple time steps. When you create the join data set, COMSOL Multiphysics gives you a vectorized list of the parameters in order to identify the base or benchmark solution. Mar 23, 2023 · For my topology optimization, I have an objective function which depends on the results of two study steps (Stationary & Eigenfrequency from solid mechanics). It is also easier to run the whole sequence in one go. At a glance, the method for this includes: Opening an existing model (e. Second, the approximate solution to the problem is solved at discrete points in space defined by this mesh. Study and Study Step Types in the COMSOL Multiphysics Reference Nov 5, 2017 · I am encountering a similar problem like in the referenced post. You can use one study with two solvers. m. To ensure that the effect of a multiphysics coupling is completely disregarded, select the Modify model configuration for study step check box and disable it in the study step, or disable it manually in the Model Builder. The preset studies vary depending on the physics interfaces you include in a simulation. In this way it is easy both to run each study individually, and also to run both at the same time. normB)" for the different parametric runs to one dataset, which then should contain ( abs (mf. Asad Sheikh. You will also learn how to use the Application Builder, which allows you to transform a Stationary. Right-click Study Sequence to add the study steps that are The Time Dependent study step solves for the period of time from 0 to T_end = 4T0. My structure is pre-stressed by a stationary compression force P0. In my example, I have the output times for Step 1 set up as: range (0,0. The idea is to simulate a block pushing into a Nov 18, 2015 · Click Update in the settings window's toolbar. Apr 14, 2023 · The problem here is when I add multiple wavelength domain steps under the optimization node (see screenshot), I can not choose them in the objective function section of the optimization node, as it only shows the last wavelength domain step in the "Evaluate for" menu. The Time Dependent () study and study step are used when field variables change over time. The full output time range is split into two subintervals: from 0 to 3T0 and from 3T0 to T_end. In this blog post, we review not only these physics interfaces and study steps but also a selection of RF Module Application Library examples applicable to each. Nathan Oborny. The studies generate a solver sequence with the solvers and other solver features that correspond to the study steps in the study. 3/ solve for ht in time_dependant (by clicking on "stored solution" for the "variable not solved for") Jan 15, 2016 · I am using COMSOL 5. Jan 9, 2019 · It only produces constant stress and displacement. The Physics interface column contains the names of all true physics The third step is a different eigenvalue step which should again tae he potentials from the first step and compute a new set of eigenvlues. The second subinterval is of the most interest since it is assumed that the steady state takes place from time 3T0. A Study node () holds all the nodes that define how to solve a model (see Figure 20-1 ). The study contains multiple steps, where the first step solves the electromagnetic model. Specifying material properties. normB)_ (first parameter combination) + abs (mf. The software plots the dataset of the selected Dec 11, 2011 · I have attached the model (v4. A parametric sweep allows you to change the parameter values through a Results While Solving. In heat transfer, it is used to compute the temperature field at thermal equilibrium. The graphs for the different nonlinear and linear solve steps are concatenated. Attachments: Selecting, adding, and running a study for a model is necessary in order to compute it. Step 1 and Step 2 were very similar, but with different output times (but that's not all, please read on). In the next five parts of the course, we address this topic in depth. EDT. 3, you can define different boundary conditions per study, without changing the model tree. This study step performs an FFT from the time domain (the input) to the frequency domain (output) for a All of the numerical methods used within COMSOL Multiphysics® discretize the modeling space via a Mesh that serves two purposes. for example at the beginning of the process In this 10-part course, you will get an introduction to optimization, learn how to perform multiple types of optimization using the COMSOL Multiphysics ® software and the Optimization Module add-on, and, in the process, learn about the benefits of combining multiphysics simulation with optimization. 025,5) and for Step 2 set as: range (5,0 Nov 5, 2017 · I have a study (acoustics simulation, solving in the frequency domain) and two study steps. Regards, Henrik. Changing the control variable discretization element order to Constant. My objective function can be computed using an Evaluation Group in post-processing (using a combined dataset from the Time Dependent. Using a simple parametric sweep study, we show you how to tabulate your data and display it in an informative way. When trying to determine which study is most appropriate for a specific modeling scenario, you should consider your analysis objectives. When you use separate studies you have to make more settings in the study node to point to the results in the preceding study. After running a COMSOL Multiphysics simulation that yields multiple results, there are specific ways to postprocess the data. May 28, 2012 · So for saving time I am going to divide this long range into small ranges, say 2 small ranges with different step sizes. There are a couple of ways that this can be done, as are described below. 1. Thank you so much for your time. Run the simulation. dC/dt=d (K*dC/dx)/dx. The study consists of two study steps: a Time Dependent, Fluid study step, solving for the fluid velocity A one-way coupled approach using a single study. Learn how to understand and change the element order of your multiphysics models. In this installment of our optimization course (Part 6 of 10), we start with an introduction to shape optimization, explaining what it is and providing an overview of the features and functionality in the COMSOL Multiphysics ® software for performing this type of optimization. Be aware that this option may generate a lot of output data. The first step involves a block deforming the surface of a larger surface beneath it some amount (deltaY), then I would like to transition to a step where I fix deltaY=0 and create a constant velocity in the x while maintaining the block in a position where the surface underneath it is deformed. Absolutely right to not respond to this. Oct 1, 2012 · As of Comsol version 4. As an alternative to the concatenation of solutions (time-dependent or parametric solutions, for example), it is also possible to use summations to combine solutions (such as creating a solution that is the sum of various Using the Shape Optimization Interface and Study Step In this installment of our optimization course (Part 6 of 10), we start with an introduction to shape optimization, explaining what it is and providing an overview of the features and functionality in the COMSOL Multiphysics ® software for performing this type of optimization. Jul 25, 2014 · Oct 1, 2014, 1:09 p. The first step involves a block deforming the surface of a larger surface beneath it some amount (deltaY), then I would like to transition to a step where I fix deltaY=0 and create a constant velocity in the x while maintaining the block in a position where the Apr 14, 2023 · Using multiple study steps (of the same kind) under one optimization node. Posted 16 nov. ,3. Using the Shape Optimization Interface and Study Step. Table 20-1: The relationship between Common Study Steps and Solvers. To add a Study Sequence node, right-click Study/Solver Defaults () and select it from the context menu. Select the Plot check box to allow plotting of results while solving in the Graphics window. Hello, I am simulating a vibrating mechanical structure. This could be determining the equilibrium state, time-dependent evolution under given external inputs, finding the Apr 21, 2021 · First: I prepared it as two study steps ( Step 1: Time Dependent A and Step 2: Time Dependent B) under the same overall Study. nf ij dl bk yz nn aj nh zs nz