Hi, im trying to make a projection in a 3d comsol model. All my attempts have failed (I have tried to put all the parameters in the auxilary sweep, setting the . I think when we are using auxilary or parametric sweep the term speed no where related. Exercise . Best, All rights reserved. I'm running COMSOL simulations in a 64GB RAM workstation. The auxiliary sweep is suitable to use if you are not having any geometry change, parametric sweep is suitable it you are to change a thickness, length, diameter etc. Indeed this tick appear rather recently (and discretely ;) Sweep through and solve variations of a model. That is what I did and seems to work well. I need to classify the lines based on the line length. It also uses the previous solution as initial guess for the next parameter step, speeding up convergence of each step. In addition, this feature can help you determine a material property based on experiment results. . Switch between mold materials in results. Study / Parametric Sweeps Instead of manually changing these property values and re-solving each time, you can perform a parametric sweep with COMSOL -- The auxiliary sweep is suitable to use if you are not having any geometry change, parametric sweep is suitable it you are to change a thickness, length, diameter etc. Noman Iqbal. Sounds strange, but the parametric solver does not loop through geometry and mesh. Dear Concern, Hope you are doing well. I would like to know how these two differ and when one is more suitable than the. A Material Sweep study solves your model with materials that you specify and provides you with comparative results of how those materials affect your model. As far as I have understood, the continuation solver can be used only with an Auxiliary Sweep. For example, if you want to monitor stress on a film as thickness increases, instead of changing the thickness every time for each simulation, use a parametric sweep i.e range(1,0.1,10). when it is possible to use both parametric sweep and auxiliary sweep which is better in terms of accuracy and speed? But on the other hand, this makes it possible to change geometry and mesh between steps, as well as distribute steps, e.g., over nodes in a cluster. Piezoelectric coupling between the rectangular substrate and rectangular (This statement is from wikipedia, BTW). When I try to inject a sample, it says missing plate or rack. Originally when I add a geometry-related parameter, I got the "Parametric Sweep Parametric solver does not support parameters in geometry or mesh." The auxiliary sweep however is used when material property comes into question. Review the topics in the table of contents, or browse Webinars for more great material. It is very useful. Thanks in advance Regards. lvaro, About the parametric sweep, after some tests, I found that this "parametric sweep" can be applied to any parameters, no matter geometry/mesh-related or not (input, source, etc. Use predefined materials from software in model. Exercise Files I don't know if this can be generalized, but I have noticed this in What is given by the term 'surface recombination velocity" in terms of a contact? If you find a case where this automatic detection does not work, please report it to COMSOL support. Parameters, Variables, & Functions, Studies & Solvers, Structural Mechanics, Error: Failed to compute elastoplastic strain variables, Running parametric sweeps, batch sweeps, and cluster sweeps from the command line, How to Add Stop Conditions to Solvers in COMSOL Multiphysics. Then you will see a "Job Configurations" node added, with a "Parametric 1" sub-node under it. However, the output power doesn't change with resistor value. Just make sure to set 'use parametric solver' under the Parametric Sweep > Study Extensions to 'OFF'. Our partners will collect data and use cookies for ad personalization and measurement. It also uses the previous solution as initial guess for the next parameter step, speeding up convergence of each step. In this tutorial video, we will teach you how to implement a parametric sweep with the COMSOL software. When I make changes to this parameter, COMSOL is able to apply the change to these variables when I press the update button without re-solving the physics. I'm using comsol semiconductor module to model the charge transport in a chunk of semiconductor I vary the thickness of the semiconductor and solve the model as a parametric sweep. A parametric sweep allows you to change the parameter values through a specified range. Visualize the results from a parametric sweep. Discussion Closed This discussion was created more than 6 months ago and has been closed. COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH), www.comsol.com/blogs/maximum-evaluations-on-parallel-sections/, Running parametric sweeps, batch sweeps, and cluster sweeps from the command line, How to Use the Cluster Sweep Node in COMSOL Multiphysics. ), About the parametric sweep, after some tests, I found that this "parametric sweep" can be applied to any parameters, no matter geometry/mesh-related or not (input, source, etc.) Do they? Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. However, I didn't document it and just avoided the automatic setting from then when I did geometry sweeps. the technique explained here: http://www.comsol.com/blogs/maximum-evaluations-on-parallel-sections/ . You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version I indeed had a case some time ago, when the automatic detection had not worked. Jeff. The parametric solver performs an "inner sweep", which is optimized for performance in the sense that it tries to avoid reassembling and refactorizing the Jacobian or reassembling other constant vectors. Watch the video to see how to implement this type of parametric study using the COMSOLMultiphysics simulation software. Features include the Table Surface plot type, tables, and the ability to export the data to other programs. To start a new discussion with a link back to this one, click here. The parametric sweep functionality, in contrast, performs an "outer sweep", meaning that it essentially solves a set of independent models. Waranatha L Abeygunasekara. I used release rate ks=1e-6, 5e-6 and 25e-6 in parametric sweep, but all the time I get only one plot even though I select all . Suppose I have a parameter that I know will change neither the mesh nor the physics (magnetic fields no current and electrostatics), but only the definition of some variables in the model. These devices are fabricated under different conditions and I would like to compare the mobility at each instance. http://www.emphys.com, Hello, Sounds strange, but the parametric solver does not loop through geometry and mesh. BITS Pilani, K K Birla Goa. The value of the "Use parametric solver" option could be "Automatic" or "Off", both will be fine. Using a simple parametric sweep study, we show you how to tabulate your data and display it in an informative way. I checked auxiliary sweep in my stationary solution and added the parameter (which i before defined in global definitions as 1[1].) 8 Replies, Please login with a confirmed email address before reporting spam. [/QUOTE] I am working on an implantable drug delivery system. Posted Feb 29, 2016, 4:58 a.m. EST Send Private Message Flag post as spam. If any such use is detected, the parametric solver will not be used. The auxiliary sweep is suitable to use if you are not having any geometry change, parametric sweep is suitable it you are to change a thickness, length, diameter etc. Watch the video to see how to implement this type . Nils Malm, Nils, This video uses a parametric sweep (created in a previous video, Performing a Parametric Sweep Study in COMSOLMultiphysics) to detail the ways in which tables can be used in simulations that give multiple results. Just make sure to set 'use parametric solver' under the Parametric Sweep > Study Extensions to 'OFF'. Hello David, This video uses a parametric sweep (created in a previous video, Performing a Parametric Sweep Study in COMSOL Multiphysics ) to detail the ways in which tables can be used in simulations that give multiple results. Sweep through and compare different materials. You have reached the end of the Learning Center. listed if standards is not an option). Parametric Sweep. A Material Sweep study solves your model with materials that you specify and provides you with comparative results of how those materials affect your model. I have J-V characteristics (both dark and light) for some solar cells. Instead of manually changing these property values and re-solving each time, you can perform a parametric sweep with COMSOL Multiphysics . Your internet explorer is in compatibility mode and may not be displaying the website correctly. Select, add, and run a study for your model. After running a COMSOL Multiphysics simulation that yields multiple results, there are specific ways to postprocess the data. We will continuously update the Learning Center with new topics and materials, so be sure to check back often! I notice the order of sweep is parametric first, then function sweep (maybe it is the default). warning Your internet explorer is in compatibility mode and may not be displaying the website correctly. I changed the needle and calibrated its position but I still get the same problem. I am trying to simulate similar bimorph piezoelectric harvester with below commands. In this tutorial video, we will teach you how to implement a parametric sweep with the COMSOL software. A parametric sweep allows you to change the parameter values through a specified range. When I make changes to this parameter, COMSOL is able to apply the change to these variables when I press the update button without re-solving the physics. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version I am guessing: the sweeps over the geometry and mesh need to go on the parametric sweep; the ones over other parameters (inputs, change on boundary conditions) on the parametric solver. I even get How to do Piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch? It seems that "parametric sweeps" have more features and are easier to plot (you can tableplot "inner solutions" or "outer solutions") So it seems like the only reason why "auxiliary sweeps would still be included in COMSOL would be if they compute faster, or had some other benefit. listed if standards is not an option). Posted Apr 5, 2013, 4:22 a.m. EDT I have a slab of semiconductor sandwiched between two schotkky contacts. Parametric sweep is used to perform a sweep on (change) geometric properties such as thickness, length etc. Review the topics in the table of contents, or browse Webinars for more great material. -- When I tried to add a geometry parameter to a sweep already containing other parameters, I obtained the same problem than you (even turning the study extensions off). You have reached the end of the Learning Center. Using a simple parametric sweep study, we show you how to tabulate your data and display it in an informative way. Frequency Sweep and Parametric Sweep. Therefore, I would like to know if it possible to combine a Parametric sweep (concerning the geometric parameters) with an auxiliary one (containing the displacement only), or if there is any other way to efficiently tackle this problem. Use probe to reduce the accumulated data. I am going to have 3 different probes in my qPCR work that I am going to do. I have noticed that solution to my comsol model can depend on, mesh, initial guess and also on which solver is being used. Your internet explorer is in compatibility mode and may not be displaying the website correctly. Define your own custom material from scratch. To start a new discussion with a link back to this one, click here. Is there any way I can change this order? Send Private Message Flag post as spam. Aiman Memon. Posted 13 aot 2012, 00:06 UTC+2 Version 5.2, Version 5.2a 2 Replies . I have dataset which shows the length of power lines. Instead of manually changing these property values and re-solving each time, you can perform a parametric sweep with COMSOL Multiphysics . Combine material sweeps and optimization. Instead of manually changing these property values and re-solving each time, you can perform a parametric sweep with COMSOL Multiphysics . After this, everything will be OK. This is regarding P3HT:PCBM bulk heterojunction organic solar cells. I am using a 2707 waters HPLC device. Changing this setting should not be necessary since the "Automatic" option looks for parameters being used in geometry and mesh settings. [QUOTE] Your Discussion has gone 30 days without a reply. Your internet explorer is in compatibility mode and may not be displaying the website correctly. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. In this tutorial video, we will teach you how to implement a parametric sweep with the COMSOL software. Please login with a confirmed email address before reporting spam Hello All, I am trying to run a parametric sweep under a frequency sweep study. Deciding which materials will perform best, subject to your design and performance requirements, is an important part of product development. You can add a second study with an auxiliary sweep in which you solve no equation at all, i.e. Posted 14 feb 2022, 17:00 CET Version 5.3a 2 Replies. Having fun COMSOLing It is very useful. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version [/QUOTE] Edgar J. Kaiser It may also be that it was still the 4.2 or 4.1 version, not sure here. Ant this time, what is created from the parametric sweep is a "Parametric 2" node just under and at the same level than the Solver 1. We will continuously update the Learning Center with new topics and materials, so be sure to check back often! Edgar listed if standards is not an option). You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version I have noticed that open circuit voltage is a little less for the annealed devices when compared to un-annealed devices. Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. In most cases you can either use auxiliary or parametric sweep to sweep the study over a certain parameter. This is done by adding a material Switch node, specifying the materials to switch between, and then adding a material sweep to your study. Please help to find the reason. Instead of having to manually change the materials specified in your model and re-solve your simulation each time, you can automate this process in the COMSOLMultiphysics software by performing a material sweep. Thanks for the clarification about the two names "Parametric Solver" and "Parametric sweep", Learn how we and our ad partner Google, collect and use data. Edgar J. Kaiser Abhilash Kumar Tilak. -- This makes it suitable for solving models in pseudo-time, such as contact and plasticity problems. Thank you all for sharing useful information. I have had a similar problem right now, in Comsol 4.4. In this case, the parametric sweep was creating a parametric solver node. If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base. It can be used to vary material property such as density, thermal conductivity, or any other material coefficient. http://www.emphys.com, Hi Nils 0 Replies, Please login with a confirmed email address before reporting spam. Use functions to define material properties. 2)When "joining", or comparing, solutions, you will be asked to choose . I have designed reflectarray element to generate OAM beams at 5.8GHz and feeding it though Horn Antenna on HFSS. I'll do my best to stick to these from now on ;) But when I do a parametric sweep on this parameter the solver re-does the physics each time (not the mesh thankfully), even though the parameter only effects the variables in the model, and I have parametric solver set to automatic already. when it is possible to use both parametric sweep and auxiliary sweep which is better in terms of accuracy and speed? ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 So far I have been using the default settings. Usually, the auxiliary sweep is used when loading is too high to give unstable results, therefore, through sweep those are increased slowly . 1) Right click on 'Data Sets' in 'Results' section and click on 'Join'. However recently I have noticed that when I have a much finer mesh, computation time is .This is regarding the numerical solving of the drift diffusion equations. I'm interested in knowing the definition, and also how hole and electron surface recombination velocities vary this is regarding simulating solar cells using comsol semiconducting module. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. I would like to know how these two differ and when one is more suitable than the other, and also about the performance (which is faster) when you can use both. listed if standards is not an option). This will vary the thickness at steps of 0.1 from 1 to 10. Copyright 2022 FAQS.TIPS. regards, After running a COMSOLMultiphysics simulation that yields multiple results, there are specific ways to postprocess the data. Use the same materials for multiple components. The terminology is admittedly a bit confusing with respect to parametric sweeps and the parametric solver. Applicable simulations include those with auxiliary and parametric sweeps, function and material sweeps, and time-dependent and . 10 votes 7 thanks. The parametric solver performs an "inner sweep", which is optimized for performance in the sense that it tries to avoid reassembling and refactorizing the Jacobian or reassembling other constant vectors. The solution to this problem is to remove any existing solver configurations, and select "Show default solver" again. Good luck. Exercise . Suppose I have a parameter that I know will change neither the mesh nor the physics (magnetic fields no current and electrostatics), but only the definition of some variables in the model. However, if I start over and select a seep only on the geometry parameter, it works! This is done by adding a material Switch node, specifying the materials to switch between, and then adding a material sweep to your study. Yes you can do that. Ivar, Hello, Therefore, I would like to know if it possible to combine a Parametric sweep (concerning the geometric parameters) with an auxiliary one (containing the displacement only), or if there is any other way to efficiently tackle this problem. Cheers Cheers 0 votes 0 thanks. Best regards, I want to have function sweep first, then parametric sweep (I notice there might be some convergence issue on the order as I am using reuse solution from previous step). This means that each parameter step will be more expensive to compute since degree of freedom allocation, etc, is redone separately for each step. A question our research team is Hello, good day! best regards 17 Recommendations . I would really like to be able to plot quantities against this parameter and have access to a drop-down menu in the results section like I would if I did a parametric sweep study. I chose Specified combinations, gave a range of 4 steps and chose run continuation for last parameter (but it is the same for no parameter and then reuse solution yes) After full wave simulation, i am not getting desired results i.e Radiation pattern More Waranatha L Abeygunasekara's questions. Dongguk University. Auxiliary Sweep in Submodel study in Submodelling. Features include the 2D Table Surface plot type, tables, and exporting the data to other programs. In most cases you can either use auxiliary or parametric sweep to sweep the study over a certain parameter. Edgar Discussion Closed This discussion was created more than 6 months ago and has been closed. Parameters, Variables, & Functions, Studies & Solvers, Structural Mechanics And accuracy is depend on your parameter or geometry like whether it is decreasing or increasing (dependent parameter) with ur parameter changes. [QUOTE] Any ideas? Version 5.2 28th Sep, 2020. The parametric solver is also a "continuation solver", meaning that it can control the parameter steps taken in a way similar to a transient solver with automatic time step control. Yes you can do that. When using simulation software, this means re-solving a simulation multiple times. Version 5.0 COMSOL AB. Applicable simulations include those with auxiliary and parametric sweeps, function and material sweeps, and time-dependent and frequency-domain studies. The model will be solved again and again for any combinations of parameters you define. A parametric sweep allows you to change the parameter values through a specified range. Sankha Mukherjee . BTW, the above tests are conducted with COMSOL 5.0. As a result, selecting and then testing different materials is oftentimes necessary. This is only possible as long as the degrees of freedom stay the same; so it cannot be used when the geometry or mesh is modified.

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