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Please could anyone help me with this??

Failed to find consistent initial values. Undefined value found. NaN or Inf found when solving linear system using SOR. Last time step is not converged. - Feature: Time-Dependent Solver 1 (sol1/t1)

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How to simulate the load of a displacement

I am simulating a RC beam, which I want to load a displacement of 4mm/s, I do not know how to implement this in Comsol. Should I use "prescribed displacement"? In addtion, I have met the error '...

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motion of two particle by dielectrophoresis force

hi. I want to simulate motion of two large particle that immersed in a fluid chamber. the particle move by dielectrophoresis forse. I use the fsi model of comsol. but the simulation diverged very soon....

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turbulence flow

when i simulate a turbulence flow, i see the velocity on walls is not zero. anyone know about this??

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a very simple test, however, gave unexpected result

Hi,I set up a simple test case to understand COMSOL and FE simulation, however, could not understand the result.2D, linear elastic material in solid mechanics interface, stationary study step. a block...

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Vibro acoustic mehod for a water pump

Hi Could someone tell me if Comsol is able to analyze noise produced by a water pump? If yes, is there any example to be shared with me?Tx in advanceP. SOUBIRAN

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Failed to save model. The file 'aa.mph' is locked by another program.

After the call from Matlab, we failed to save the model, and the Eerror Message is :"Failed to save model. The file 'aa.mph' is locked by another program." Using "clear all""clc" in Matlab is...

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Ray power calculation in a section of tapered fiber

HiI have an optical fiber simulation running on Comsol 5.1. I have a fiber with a tapered end and am using the Ray Optics module with rays tracing showing rays propagating along the fiber. I would like...

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Floquet boundary conditions in thermoacoustics

I'm trying to build a finite element model for an acoustic metamaterial, where losses play an important role. However, I'm having some trouble when combining the thermoacoustics physics with Floquet...

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How to simulate hologram in COMSOL to interact with particles

Hi all, I want to construct a hologram and want to use it to interact with Au particles, Is it possible in comsol multiphysics? Can anyone suggest me which module should i use? and how would it be...

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Error message: Failed to find a new solution

Hi, I am new to comsol.I have created a geometry which has glass fibre block on which there is a platinum strip to study the Joule heating due to current flow through platinum strip. On computing it...

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Importing the MATLAB , FORTRAN or other language script

Can it be possible to import FORTRAN script in initial values? Instead of sine wave as initial condition we want to use random initial wave condition. The random wave initial condition is in FORTRAN...

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Accessing Uplus and Yplus values and also determining Wall shear stress value...

Hello all,I am trying to solve a turbulent channel flow with Re of order 10000. I am using a SST model.I am trying to plot uplus and yplus values and finally find wall shear stress values to verify my...

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Bad termination error; cluster compute

I'm running a comsol model on a cluster using the syntax:comsol -clustersimple -nn 5 -f hostfile batch -inputfile <filename.mph> -study std1 -outputfile <ofilename.mph>This runs if the...

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Transfer a diffusion flux in a solid electrode to an porous electrode

Hello all together,I have a Problem, which maybe have been discussed several times in a way here, but not for this special case. I am simulating a 3D model of an anode in a battery. The 3D model...

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COMSOL Conference Boston: Early bird savings deadline this Friday (September...

Hello,This year’s COMSOL Conference is shaping up to be our finest one yet. The conference, running October 3-5, will feature over 40 technical minicourses and workshops; demo stations and social...

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Plasticity in Multibody Dynamics

Hello,I want to implement a rotating ring and a cube, that gets in contact with the ring and adds friction. This should happen with plastic deformation. So far I understand that one cannot combine...

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Rigid connector alternative for rigid body solid mechanics

Hello, I noticed that once i apply rigid domain to my 2D model in solid mechanics, the rigid connector becomes invalid. What is another way to keep the solid fixed (not let it move in x and y...

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Finding force within an electrical field using electrostatics

Hi,I am modeling a mems resonator. The resonator has electrodes attached to it (rectangle bars in image). Underneath the electrodes are another set of electrodes which are fixed. Electrodes attached to...

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Electron Beam Induced Current in Silicon

The below post is related to an archived discussionHello there!As said in the title, and in relation with the above unanswered article, I am also trying to model an electron beam induced current inside...

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