Latest Discussions - COMSOL Forums Most recent forum discussions Sat, 23 Jan 2021 01:01:03 +0000 COMSOL Forum: Latest Discussions optics desing <p>I want to couple two things togther from diffrent files (optics desing )and (solar cell) to see the temperature distribution in cell after concentrating the rays in small area of that cell .is that even possiple in comsol?? if the answer is yes ,how i can do that.</p> Sat, 23 Jan 2021 01:01:03 +0000 4.2021-01-23 01:01:03.277071 parameter estimation study and the inverse modelling problem <p>Hi everyone, I am trying to learn more about the parameter estimation study and the inverse modelling problem in Comsol I found this on the blog: s Here, the example is with time dependent condition. For my case, I am not using a time dependent study and I was wondering if is possible to use a stationary study instead. I tried to search on the website but cound't find anything more than the link I already wrote. My question is if is possible to use the stationary condition? If not, there an alternative to how approach the problem other than what is in the link I posted before?</p> <p>Thanks to all who can help me here. Chiara</p> Fri, 22 Jan 2021 17:09:31 +0000 4.2021-01-22 17:09:31.277041 Rising bubble problem <p>I am trying to simulate bubble rise problem. I want to find its center of mass and rising velocity at different time step. Please help me with this. It will be very greatfull.</p> <p>Thank you.</p> Fri, 22 Jan 2021 15:54:52 +0000 4.2021-01-22 15:54:52.277031 How to properly show displacement versus Force for a capacitive parallel plate with multiple electrodes? <p>For my master thesis I want to determine through simulation the displacements due to applied forces. The sensor has 4 bottom and 4 top electrodes that do not complete align along with a bump on top which will be where the force is applied.</p> <p>I used the capacitive pressure sensor model of COMSOL as guideline and tried to implement the component coupling average and integration. Ideally It would be possible to see the displacement of each of the top electrodes.</p> <p>How can I plot the displacement of the electrodes versus the force? And which selections should I make in order to correctly visualise the displacement?</p> Fri, 22 Jan 2021 15:15:41 +0000 4.2021-01-22 15:15:41.277011 Geometry from autocad <p>Hello! I'm new to the COMSOL, could you please tell me how to set the geometry imported from AutoCAD to the origin? in my case, it moves and, accordingly, then it is quite difficult to adjust the rotating parts</p> Fri, 22 Jan 2021 14:26:41 +0000 4.2021-01-22 14:26:41.277001 Difference in fluxes <p>Ciao tutti</p> <p>I have made an electrochemical 1D simulation, cyclic voltammetry in a rather complicated system. When I check the fluxes in terms of electric current, the normal total flux and the x component of the total flux are somewhat different, see attached image. As my simulation is in 1D, they should be equal. Where am I wrong?</p> <p>Lasse Murtomäki</p> Fri, 22 Jan 2021 07:39:01 +0000 4.2021-01-22 07:39:01.276981 Study of Piezoelectricity of 1D ZnO Nanorods/nanowires by applying an external force <p>Hi guys, Here I'm just a new user in COMSOL Multiphysics software. I want to study the piezoelectricity effect of 1D ZnO NRs made sensor device by applying an external force and find out the variation in current Vs voltage Vs appied force. Pl suggest me how to start. Thanks in advance</p> Fri, 22 Jan 2021 07:37:42 +0000 4.2021-01-22 07:37:42.276971 Extracting the results from a 3d axisymmetric model <p>Hi folks, i'm facing an issue extracting the results from a 3d axisymmetric model (see de pic below). i want to extract the contact pressure 'solid.Tn' but I couldn't from the export plot and I didn't know how with mphinterp (wrong dimension error). could anyone help me?!</p> Fri, 22 Jan 2021 04:46:56 +0000 4.2021-01-22 04:46:56.276942 Confusion about subtracting two geometric entities <p>I have a question about using the Difference boolean operation when building a 3D geometry.</p> <p>Let's say I am trying to create a final geometry composed of two parts: (1) a cube which is completely solid except for a hole in the center (denoted by C), and (2) a solid sphere (denoted by B) that fills the hole in the center of C.</p> <p>So the steps I take to create this are (COMSOL model attached): 1) Create a solid cube (denoted by A). 2) Create a solid sphere inside the solid cube (aka B). 3) Do the Difference operation A - B = C, with the option "Keep input objects" checked.</p> <p>Now my confusion is what are the end products remaining. Is it just B and C (which is what I want), or is it A, B, and C (which is not what I want). In other words, does "input objects" refer to both A and B, or just B? And is A removed automatically by default? If not, how would I just get B and C?</p> Thu, 21 Jan 2021 20:07:12 +0000 4.2021-01-21 20:07:12.276912 Wave velocity problem in Elastic Waves, Time explicit solver <p>Hello ,</p> <p>I am expericencing one problem in the Elastic Wave module. Hereby, I try to reproduce the solutions in that article "S. Duczek, M. Joulaian, <em>Numerical analysis of Lamb waves using the finite and spectral cell method Int. J. Numer. Meth. Engng 2013; 00:1–28</em>" (One can find the problem in p.18-p.24). Here is the summary and the problem;</p> <p>Pure A0 and S0 modes are excited by exciting the signals from 2 symmetric point source with opposite directions. COMSOL can grab resulted excitation structures but there are problems about wave velocities and grabbing small amplituted scattered waves. (Please see the images arrival of the wave to the integration point takes longer in COMSOL ). With the exact setup of problem COMSOL wave seems slower than the article. What could be the reason and how can be solved? Thank you in advance.</p> <p>I already increase the mesh (max.size = 10 per wavelenght) and solve it again.</p> Thu, 21 Jan 2021 14:10:40 +0000 4.2021-01-21 14:10:40.276911 How to introduce a damage parameter <p>Hi,</p> <p>Is there a way to model the evolution of damage in Comsol? The damage parameter on rate form is: <img class="latexImg" src="data:image/png;base64,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" /></p> Thu, 21 Jan 2021 13:47:13 +0000 4.2021-01-21 13:47:13.276901 Cell Periodicity applied to buckling <p>Hello, I'm studying failure mechanism of periodic honeycomb structures. The Cell Periodicity module introduced in Comsol 5.4 was very useful to calculate the homogeneized Young Modulus E. Now I'm trying to use it to study Linear Buckling and plastic collapse but I've been having some issues setting it up. Should I make a new study for Linear Buckling, or is it supposed to go inside the Cell Periodicity study I used for the E Modulus? Should I add a for the buckling or the modulus makes one automatically? is it even ok to use Cell Periodicity for this or should I just use Periodic Boundaries.</p> <p>If it helps, what I'm trying to do right now is a comparisson with Gibson analytical models of failure of cellular materials with the results of a FEM model:</p> Thu, 21 Jan 2021 11:15:19 +0000 4.2021-01-21 11:15:19.276892 A new physical field is applied on the basis of the deformation geometry <p>Well, I apply different forces to a model to make it deform to different degrees. Now I want to apply the physical field of current to different degrees of deformation. How should I operate it?</p> Thu, 21 Jan 2021 07:02:26 +0000 4.2021-01-21 07:02:26.276873 curves be converted into solids <p>Hello, I have a question I want to revolutionize a sketch, can curves be converted into solids? I attach the most illustrative image.</p> Thu, 21 Jan 2021 06:54:49 +0000 4.2021-01-21 06:54:49.276872 Question <p>How do you apply current analysis on a deformed geometry?</p> Thu, 21 Jan 2021 06:24:32 +0000 4.2021-01-21 06:24:32.276863 Recommended clock rate for COMSOL simulations? <p>I was curious if there's a recommended range for CPU clock rates. I've got a CPU with a 2.13 GHz clock rate. Would this be enough for most chemistry and fluid-based COSMOL simulations?</p> Thu, 21 Jan 2021 01:19:37 +0000 4.2021-01-21 01:19:37.276852 Does COMSOL plan to enable multithreading in the future? <p>I work with some fairly old university servers (2010s), so their clock rates can be as low as 2.13 GHz but can have as many as 40 cores (2 threads per core). While I can turn off the extra thread to balance the # of threads and cores, I'm still interested in getting the most bang for my buck, hence my interest in multithreading/hyperthreading.</p> Thu, 21 Jan 2021 00:58:27 +0000 4.2021-01-21 00:58:27.276842 JVM_NOT_FOUND after every Java update <p>Is there a way to fix this issue with Comsol? After every Java update we have to point Comsol to the new version on multiple machines.</p> Thu, 21 Jan 2021 00:03:51 +0000 4.2021-01-21 00:03:51.276832 How to easily identify (with color?) different components of geometry <p>Is there an easy way to identify different components of a geometry? In other words, I want to easily associate a component of the geometry that I can visualize in the window, with the component name underr the Geometry tab in the Model Builder.</p> <p>If I click on the different materials I have listed under the Material's tab, the releveant components are highlighted. I'm trying to do a similar thing with the Geometry tab. Or, at minimum if I can color different geometry components they can be easily identified. I tried assigning different materials different colors, but they don't appear the color they are supposed to.</p> Wed, 20 Jan 2021 19:34:57 +0000 4.2021-01-20 19:34:57.276822 help me to find shear stress across middle of the interface along lap length <p>hello.., can some one help me to find normal and shear stress distribution accross middle of overlap length?? pls check the image attached!![]</p> Wed, 20 Jan 2021 17:38:35 +0000 4.2021-01-20 17:38:35.276821