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How to save a solution

Hello , I have a question about how to save a Comsol solution. I did a model in Comsol 4.2 , after 31hs I got a solution , I saved the model but when I opened it again the solution was not there , so I...

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Heat Transfer in a bitumen tanker

I am trying to model a steel tanker filled with molten bitumen. The tanker is insulated and the bitumen is heated by two propane burners ( in form of U) located at the bottom. For the bitumen I have...

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Initially Stressed Bimorph Beam - Electrostatic Actuation

Dear All, I am attempting to model a bimorph which naturally deflects upwards due to stress in the lower layer of the beam. So far, this part has been successful. The top of the bimorph is silicon, and...

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Solving Time dependent problem with stationary solver at the same time.

Hi, I am trying to simulate a brushless DC motor. I want to make comsol to solve the problem in the form of time dependent. However, during each time step, comsol should solve and obtain a stationary...

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Calling all electrochemical enthusiasts - March courses on Electrodeposition...

Join us this March for our special courses focused solely on electrochemical applications. First, we will be offering our popular Electrodeposition course where we will cover electrode kinetics, the...

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the electric potential dependent on temperature

hello, please help me i am trying to make a model of an electrode in a cylinder of biological tissue, i want to make the electric potential on the electrode dependent on the temperature of the tissue,...

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Error: The file position must be a positive integer

Hello, I am going through the SAR in human head example provided. Everything is completed as per the tutorial. I am trying to solve now. However, I get this error: ==================================...

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Placing a finite element model into an electrical circuit in COMSOL 4.1

Hello, I have recently made the switch from COMSOL 3.5a to COMSOL 4.1, and I am currently unable to do things that I used to be able to do very easily, namely placing my 3-D model (drawn and defined in...

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Tutorial: Working between COMSOL 4.1 and MATLAB 2010b

Ok, here is what I figured out in order to be able to take a COMSOL model, modify it in MATLAB and then reopen it in COMSOL for further work: 1. Launch COMSOL normally; 2. Launch MATLAB by using...

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Defining MIXTURE of gases

hi friends i want to define a mixture of gases (iodine,xe,radon) at inlet each with different concentration for diffusion in the air . how can define mixture with different conc in comsol .

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Movement of air due to thermal expansion

Hi everybody! I'm trying to simulate the movement of the air in 2D and I only get errors. I use two physics: laminar flow with heat transfer. I've created a square full of air and I put easy boundary...

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Accessing the outlet value to apply in the inlet boundary

Hi. I need to set up the inlet boundary condition (temperature) in the conjugate heat transfer analysis with larminar flow. However T of inlet (fluid) should be like this: Tin = Tout + 3 K (at every...

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Apparent inconsistency in induction heating solution methods

Hi everyone, I'm new to COMSOL 4.3, and I'm trying to properly use the induction heating module. While modeling the problem of a current loop heating several iron inductors embedded in water in 3D,...

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Imported SolidWorks part doesn't behave correctly

I'm relatively new to COMSOL but I haven't had much luck finding a solution. I had an assembly in SolidWorks made of 3 parts. I created a new SolidWorks part file which had the 3 parts mated together...

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Use of global equations - An unexpected behavior depending on equation sign

I have submitted the following case in October 12, 2012 11:44....I do not yet get an acceptable solution. Maybe one of you has a solution to this. Dear Support, please have a look to my attached model....

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Heat in inductor using Induction Heating

I'm working on a model to see the temperature in all of the parts within the inductor. Since I'm using the Induction Heating physics I have to excite the inductor using Lumped Ports. However the...

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Thermal expansion of a liquid

Hi all, I’m am trying to produce a model of a fluid enclosed on all sides except one by fixed constraints(walls), on the remaining face a thin diaphragm is in contact with the fluid. As such this is a...

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Forced Vibration of Vertical Simply Supported Beam with 'Overhang'

Hi, I'm trying to simulate the forced vibration of a beam that stands vertical and is supported by two simple supports that are shaken back and forth by a motor as in the attached schematic. I've also...

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Vibrating horizontal plate.

Good Evening everyone, I have a really simple question, I'm sure someone knows the answer to my problem. I'm trying to make a model of a plate, platform, anything you want to call it, that vibrates...

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Moving mesh ALE

Hi, I am simulating a moving boundary with ALE method. My program is working fine with a certain geometry, mesh and time, but if I would like to change the geometry or set a larger time, then I get a...

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