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cluster computing mpi

Hello, I am trying to run my models from comsol on our University's super computer, and having difficulty with the $PBS_NODEFILE command. Can the PBS_NODEFILE also be used to run generic MPI programs?...

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Thermal Stress Static analysis

Dear Concerned, I have comsol 4.2 version package. In this regard i am facing a problem to define spatially varying force on a boundary in 2D space. For instance, if i have a line extending along...

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Structural analysis 2-D stress plot overlapping

Dear Concerned, How can i overlap von mises plot of 2D asymmetric formulation with a 2D plane stress formulation for the Same Geometry.

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COMSOL external MATLAB function

Hello forum. I want to use an external matlab function to define a local heat transfer coefficient distribution. If I use a very simple external function, everything works fine: for example: function...

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magnetic shielding with mumetal(nonlinear - saturation)

Hi I need some help with my model.... I have a 3D sim, A current line that generates my field and a mumetal infinite plane(1m*1m*0.5mm) The 0.5mm is the thickness of my mumetal. I have 0.5T on the...

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magned no moving

Hey. I have this problem: I have two magnets oriented so that the north pole of one facing the North Pole 2 in the common axis X. Magnets are so close to each other should be repel. But magnets will...

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Computing the inductance of a Wire

Hi! I read "Computing the Resistance of a Wire" post. It is easy for compute resistance of wire, but how i can compute the inductance of this wire?

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PDE solving or defining force in terms of displacement

Hi, I hope you are doing well, I am a new user of Comsol. At this moment, I am trying to model a cantilever beam with an applied force on its edge as a function of displacement. So, what I need is...

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Calling variable or convert T(x,y,z) = >T(x,y,t) between models

Hi: Please help! I'm very stuck with a quite straightforward problem. I've got two models: 1) Model 1: 3D Heat Transfer Stationary 2) Model 2: 2D Teat Transfer Time Dependent. How can I call T(x,y,z)...

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PDE and ODE implementation

Hi, I would like to make a frost growth model where ODE and PDE equations are involved such as: ys * d(rho,t) = d(P,T) rho* d(ys,t) = m - d(P,T) And energy balance equation k*d^2(T,y) =(m -...

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about helix geometry modeling

Hi, I am trying to model a spiraling geometry (helix-like) with a complicated cross section. Does anyone know how to do it with comsol 4.2/4.3a? I used the build-in "helix" one but that was with a...

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Vanishing geometry in nano level

Hi I'm trying to plant some nano-cylinders on a larger cylindrical base of [um] dimensions. When I plant 3 cylinders on top with 200[nm] radius, everything works just fine. But if I reduce their sizes...

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Axial flux permanent magnet generator

Hi Dr. Ivar/All, Iam trying to simulate the axial flux permanent magnet generator with two rotor and a coreless stator sandwiched between two rotor. Permanent Magnets are attached on inner surface of...

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mesh error

Hey, I was trying to follow the PDF on comsol website ( Model ID 15) to build a model for Helmholtz coil. I followed almost all the steps except for the dimensions, so the geometry should have no...

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Pressure boundary conditions

Hi All, I am working on a coupled problem involving a piezoelectric and fluid.....I need to apply the pressure from the piezoelectric after each iteration step and apply it as a pressure boundary...

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About conductive electrodes of piezoceramics layers

Hello everyone, I am working on a piezoelectric energy harvester(substructure and a piezoceramic layer). I am applying a point force on the substructure and measuring the voltage from the surface of...

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Problems with sweep mesh

Hi, I have been trying to sweep mesh a domain (3-D). It will be like a small straight tube of rectangular cross section and having turns at right angles (like a serpentine). I tried to mesh the source...

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coupling model, extrusion 2D-axy towards 3D

Hello, Is it possible to re-use temperature boundary results of a 2D-axy simulation towards a boundary destination of a 3D model (4.3a version)? Which operator could I use if it's possible? Thank you...

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Generating shear waves induced by a piston hitting to a model

I want to generate sinusoidal shear waves and observe its propagation induced by a piston hitting a 3D model. I think what I would like to do is similar to paper presented by S.Audiere...

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Joule Heating and Laminar Flow in microfluidics

I'm trying to find the temperature distribution in a microfluidic channel. The heat is generated by two electrode in a microfluidic channel. When I create the model without laminar flow everything...

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