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what is value of "relative permittivity" for gold (au) and aluminum (al) ???
any buddy help me to tell what value should make appropriate result in actuator of relative permittivity - au ____?? relative permittivity - al ____??
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How to become expert in COMSOL
Hi Guys, I am working on COMSOL 4.3a from last three months but still facing some difficulties to become expert in its use. I am not from Engineering background so don't have any experience about...
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How to unite objects with assembly mode?
Hi everyone, I'm modelling coils using the Multi-Turn Coil Domain, and I'm having trouble getting the magnetic fields to work when I finalize the geometry with an assembly (I need to use assembly mode...
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segregated vs fully coupled solver in comsol
Hi All, I have compared these two solvers for a heat transfer case with surface-to-surface radiation. Acutually simulation results, i.e., temperature distribution in the domain, are quite different....
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3D RF Module Calculation on Multiple Cores
I am planning to build a computer for running Comsol, and was hoping to find out how well Comsol can utilize multiple cores for RF Module calculations. The most demanding calculation that we would like...
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Capacitive Shielding
Hi everyone, I'm trying to model a capacitive shield made of aluminium. The shield function is to interrupt the capacitive coupling between un helical coil and a charge inside the coil. Our objective...
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draw a hollow ( half radius) cylinder
I would like to draw a hollow ( half radius) cylinder with inner radius 12mm, outer radius 25mm with length 1m. I am using COMSOL 3.5a Can you tell me how is draw hollow hollow ( half radius) cylinder?...
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Modeling nanoparticle heating
Hi, How do i model multisource nanoparticles heating in COMSOL.
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Oil Tank wtih heater
Hello, I am a new Comsol user. I am trying to model an oil tank heated by a U heater.The heater use oil at a higher temperature. The cold oil in the tank is at 30°C and the hot is at 250°C.I use...
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problem with selecting the domain, boundary or edge
Hi All, I don't know if you guys have encountered such problem: when I try to select the domain, boundary or edge from the graphic window, I cannot select anything. It seems that the selection by...
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creating plots is extremely slow
Dear Forum, creating simple line plots (with global scope) of model results is extremely slow. For quite large model files (2-3 GB of size) it sometimes takes several hours for one simple plot on a...
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Selecting a point
I want to get the co-ordinates of an arbitrary region within my model so I can see how the pressure changes at that point. Does anybody know how to do this?
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How to use Two Different Times steps in Solver Parameters?
Dear Sir, I am using COMSOL 3.5a. And I am running my simulation for 6hrs. But I want to run my simulation in two different time parts. (i.e. for 1hr i used solver parameters for time stepping range is...
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Parametric Sweep of the Move funcion
Hi, I would like to so a simple parametric sweep of the position of an element in a 2D model. I define a parameter under global definitions and then under Geometry1 I Move1 by that parameter....
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equation system
I want to use the following bidomain equation in my simulation :∇·((σi +σe)∇φe)=−∇·(σi∇Vm) I have two spheres one within the other as geometry. Inside the smaller sphere I want to introduce Vm as a...
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editing mesh
Hello, Is it possible to define mesh elements as subdomain and give each of them a source like current density? or is it possible to give each node a source? Thanks, Gizem
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Help me! Error"Internal error in boundary respecting."
Hi, all I want fix it, It is coordinate (-2,06378, 1,35209, 2,8034) Thank a lot Vinh Nguyen
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How Can A Temperature Dependent Variable Changes Permanently?
Hello, I'm using COMSOL 4.3b for simulating a laser-material interaction, and I have predefined several parameters for specifying material's physical properties such as material's density, material's...
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Error after 300 iteration steps
HI, I am very new to COMSOL multiphysics. I am using CFD> non-isothermal to simulation the room temperature. After 300 iteration steps, I received the error mas at attched. I shall be very thankful...
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Maximum values over time in a 2D spatial domain
I am running transient simulations of solute transport in a 2D domain. I would like to find a 2D spatial profile of maximum value of solute concentration over simulation time, which may not occur at...
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