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How to assign a 2D random function as porous matrix property (porosity)

Good morning, I really need your help, because I can't find anything in the help files. I have a model using the the Brinkman Equations module for 2 dimensional porous media flow. I want the porosity...

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Convective heat transfer coefficient

Hi everyone, I'm a beginner in Comsol and I have a very simple problem I can't find a solution for. Basically my model is in 2D and is very easy: I have an horizontal plate from which is flowing a heat...

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Nusselt Number Calculation

I am trying to calculate the average Nusselt # over a flat plate vs. Reynolds #. Thus I need to take the average of the derivative of temperature in the y direction at the plate for the various...

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calculation of surface curvature, surface tension

Hello every body, I've a 2-D model in Comsol 4.2a where I use PDE and a moving mesh interface. I need to calculate the surface curvature on a boundary. I don't know how to do this accurately in Comsol....

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CUDA and COMSOL

Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...

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baffled mixer example

I built and solved the baffled mixer example which worked flawlessly. I am making a mistake when adapting this to the frequently performed test tube research. I followed the instructions below from the...

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Help with simulating condensation from a partially filled closed glass vial...

Hi! I am having trouble with a condensation simulation. A closed glass vial at ambient temp is partially filled with 10 degC water. When it is put in a cold room with temp of 5degC, condensation...

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Laminar outflow boundary condition does not converge!

Hello everyone, I am new to this programm and want to simulate the first part of a streamed circular duct. It serves as an hydrodynamical entry length to develop the velocity flow profile. In the...

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Dynamic Pressure Inlet (turbulent flow)

Hi all, I have a question regarding a dynamic pressure inlet. I have a large 3D model with several pressure inlets and one pressure outlet. Some Informations: - Comsol 4.0a - Incompressible turbulent...

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Restart simulation with particles already in the domain

Hello there, I have another question regarding the particle tracing module. I have a model consisting of a Laminar Flow (chns) and a Particle Tracing for Fluid Flow (fpt) interfaces. Assume that I...

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timestep in stationary study?

I am modeling laminar flow at steady-state. Error message: Undefined variable. - Variable: timestep - Geometry: geom1 - Domain: 2 Failed to evaluate expression. - Expression:...

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cell Reynold number

Dear all, I have some confusion regarding cell Reynold number option provided in COMSOL post-processing. What I understand is that cell Reynold number is calculated with velocity and length within/from...

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How to properly define inlets and outlet in "Rotating Machinery" in COMSOL ?

I want to build a model which requires to couple the mass transportation and rotating machinery of the fluid flow. I trying to approach that using 3 steps: 1. Solve the fluid flow in a stationary study...

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Velocity Profile in two phase laminar flow

Hi, I am simulating a 3D model in two phase laminar flow with level set conditions. The simulations are ok. But i am not able to see the arrow surface plot of velocity. On setting the symmetry...

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Two phase laminar flow

What is the meaning of "symmetry" in two phase laminar flow. Does it mean symmetric boundaries or symmetric flow??

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Trying to simulate electrical arcing

As the title says, I'm trying to simulate electrical arcing using COMSOL. Specifically, I am trying to use COMSOL to determine whether or not arcing will occur in a high voltage battery configuration...

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Water infiltration in a closed system

Hi,I have some problem with my model. It is about water pouring from surface of a soil column. The bottom of the soil column is bounded (also the vertical wall). Thus, the air inside soil must be...

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Turbulent Multiphase Flow in Packed-bed

Hi :)I am simulating a packed bed bioreactor. It is multi-phase & turbulent. (attached file) I am just getting errors with mixture and Euler-Euler. (bubbly is not applicable due to high quantity of...

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Free surface in liquid flow model.

I have modest experience in using COMSOL, very limited in fluid flow modelling.I've encountered a new type of problem for me, & so far cannot 'get started'; any pointer to similar examples etc...

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How to model laminar flow between parallel plates with partially slip...

Hi all,I'm trying to simulate a laminar flow between parallel plates. It's inlet velocity and outlet velocity are set to be the same---4z(H-z)umax/H^2 in x direction (only). The top and bottom...

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