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How to restart COMSOL in parallel mode with a previous solution as the...

Hi I am using COMSOL 3.5a in parallel mode (shared memory parallelism) to solve a computationally huge problem. But when I stop the simulation at an intermediate time and again run it with the solution...

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Part of module

Good day. It is possible to create a report in which it was shown as part of the model? Thank you.

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Plasmonic wire grating

Hello All, I am trying to remodel the device in the 'plasmonic wire grating' example. As a background reading I wanted to read in depth about this device. It would be of great help if anyone could...

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Surface temperature dependent heat transfer coefficient

I'd like to apply a convection heat transfer boundary condition to the attached problem. Currently I am using a constant convection coefficient (h=10 W/m2K) on the interior gypsum surface. I have...

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How to see all the surfaces or interfaces of a volume

Dear Sir/Madam, This is Keyvan,from Politecnico di Milano, If I have a 3D result including 5 layers of interfaces; how I can see this different surfaces? I am trying to see the current density...

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Coupling plate and acoustics

Hi everyone, I'm trying to model a axisymmetric disk in 2D which is actuated with 40kHz in the middle in axial direction which gives a pressure wave in the surrounding air. The air is represented by an...

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Mixing two materials

I'm trying to simulate the behavior of a model made of a material which is a mixture of two materials available in the library. The materials are mixed in unequal proportions. I'm able to calculate the...

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Frequency domain analysis in general PDE form

Hi all, As you may know, the PDE(general) module has the form of (a*d^2(u)/dt^2+d*du/dt+nabla.nabla(u)=f ). This format provides the possibility for implementing our own equation in time domain...

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Load materials from library with Java API

Hello COMSOL aficianados, We are working with the Java API for COMSOL here. Let's say you want to load the material copper into your model. It seems, according to the manual, that the only way to get...

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Gas separation with a tube membrane

Dear everyone, I am working on modeling of a tube membrane. 1, the inlet of the tube membrane is pure CO2, and O2 comes from the wall (membrane), so at the outlet you will have a mixture of O2 and CO2,...

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How to use solution as initial value for 2nd study with changed geometry?

Hello Everybody. I’m using comsol 4.3a. I try to use the solution from study 1 (stationary heat transfer) as the initial temperature value for a second time dependent study. Further a new geometry...

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Parameters in file name

Hello all, I am in a situation where I need to work with 40 or so parameters, and as a result when I export my results from a parametric sweep (with parameters appended to the file name) the file...

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Pulsed Jet

Hello, I'm trying to make a pulsed jet for a tilted Micro Jet for flow control. I want to ask you guys if it's possible to make it, how can i do it? Salut, Je suis entrain d'essayer de réaliser des...

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Parametric Sweep

Can I know how to use parametric sweep??

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Unknown oscillation in effective index and propagation constant when solving...

Hello, I recentely moved over to comsol 4.3a after using comsol 3.5a to do mode calculations in fibers. I use the step-index model found in the tutorial in Comsol 4.3a and insert the parameters that I...

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current in 1D element

Hello everybody, I have a network of 1D elements and I have modeled the current flow inside them using Coefficient from edge PDE. So after running the model I have the voltage in all the structure as...

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How to calculate the transmission

Dear all, I have a question about how to calculate the trasmission through the nanostructure. For example, in the "Optical Scattering Off of a Gold Nanosphere" tutorial, we tell comsol to solve for...

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Pipe Flow-T junction-different viscosities

Is it possible and how it can be done to have the inlet flow with 1 specific viscosity and the 2 outlet flows with different viscosities - in other words a distillation process? Thanks,. -- Arthur Rupel

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Problem in Meshing

Dear Sir/Madam, We are using a cORROSION module based on a complex imported geometry (steel cage in ac oncrete with five surface boundaries).After following the sequence of steps to simulate an OIL...

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Add time dependent equations to the physics builder

Dear All, I am trying to use the physics builder to model the thermoelectric effect. As it happens there is a step by step tutorial for this exact example available; the problem is that it only...

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