Nonlinear solver did not converge.
I'm trying to use the Particle Tracing for Fluid Flow. However, I keep getting an error saying the nonlinear solver did not converge, last time step did not converge. I've looked to make sure all of...
View ArticleResuls and Plots
Hello! every one. I have some troubles to Plot and reproduce my results, because each Plot appear one over the other and I can´t see properly the curves and 3D plots . I would like to know how can I...
View ArticleGalvanic Cell with same reaction for the anode and for the cathode
How to model a galvanic cell that has the same reaction for the anode and for the cathode? We have a Galvanic Cell with only two species Ox (oxidized species) and Red (reduced specie) and these species...
View ArticleSound transmission loss and impedence
Hello everyone! How to simulate for the sound transmission loss and impedence for the thick rectangular plate. Please help me out with step by step procedure to simulate. And matlab program for it....
View Articletemperature gradient boundary condition
I am trying to implement a boundary condition where the temperature gradient is -1. how do i do it. i am using heat transfer in fluid physics and laminar flow physics. and in a wall i have to set...
View ArticleConjugate Heat Transfer for Turbulent Flow problem
Hello,I have seen that you have helped a lot of people many times about different types of problems in COMSOL, that's why I'm contacting you.I study the aerothermal effects of a CubeSat which comes...
View ArticleSupercapacitor
Hey.I am trying to model supercapacitor but get some difficulties.Could someone who have already succeed in it kindly give me some guidance or share some details with me.I would very appreciate it.
View ArticleMagnetic field and Thermal study Combined
Hi,I am currently simulating a model (magentic field study) to evaluate the heat source distribution surrounding an copper inductor cavity and wanted to consider these heat sources asinput for my...
View ArticleConvergence criteria of the nonlinear solver are met but not all linear...
I was running Semiconductor module. The solver is fully coupled (constant Newton).The simulation shows the following warning:"Convergence criteria of the nonlinear solver are met but not all linear...
View ArticleFar-field calculation of a duct outlet
Hello,I'm working on a model of a duct that has an outlet into a room, which is modeled as a semi-infinite space. A diagram of the 3D model is attached. The black part is the duct, the grey part is the...
View ArticleEdge rotation for shell with prestressed eigenfrequency analysis always gives 0
Hello! I'm having troubles trying to evaluate the rotation of one edge of a shell element around the axis parallel to it (in my case, the z axis). I'm running a prestressed eigenfrequency study, i.e.,...
View ArticleCoupling between rf and electric currents
I would like to set a fixed potential in the rf module. If I use the lumped port I can set a potential, but this only applies if wave exication is enabled. When I activate this, my model becomes very...
View ArticleEnergy loss in symmetric heated turbulent flow
Hello,I created a simplified model which just simulates the flow of heated air through a pipe, heating up a small piece of the pipe-wall.It´s completley symmetric, so I decided to use the symmetrie...
View ArticleDiscretization tool not available
Hi, I'm attempting to switch the discretization in a solid mechanics beam problem from linear to quadratic lagrange elements (or back again.) From what I understand most people can see the...
View ArticleBasic Resistance measurement at EC with probes
Hi there, Everybody keeps asking this question but still no any simple answer here or anywhere alse, How such powerful software can't measure resistance between two points on the wire like simple multi...
View ArticleError in elPlastic element.
I ran a geomechanical model and I got this Error "Error in elPlastic element. - Detail: Lambda non positive for plastic point" , I decreased the time step and tighten the convergence tolerances...
View ArticlePressure drop calculation
How to calculate the change in pressure in a closed cavity due to volume change?
View Articlehow to plot circularly polarized light
HiI recently simulate phase metasurface : when a** left** circularly polarized light reflect on this metasurface, the reflected light would be a ** right** circularly polarized light. Here are some...
View ArticleFreezing through convergence Plots
According tohttp://cn.comsol.com/forum/thread/105901/comsol-5-2-gets-stuck-after-some-time?last=2017-04-26T18:39:50ZComsol freezes occasionally when plots are created while solving, including the...
View ArticlePlane Wave
Hi, I am struggling to simulate a plane wave propogating in air. It should be very straightforward, but I am unable to get satisfactory results in COMSOL 5.3a.Basically, I use a rectangular 2-D model...
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