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Issues with Pipe Flow and Surface Radiation interaction

Hello Comsolers! I am very new to the program, and I am having some issues regarding Non Isothermal Pipe Flow, Heat Transfer in Solids, and Heat Transfer with Surface to Surface Radiation. I have a 1D...

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List of function in Comsol 5.2

Dear All, Can anybody help me with finding the list of inbuilt functions of comsol 5.2. I want to equate my equation in the expression box of 1D plot group. I am using heat transfer module for...

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Variable boundary conditions

Hi all, I'm using the API to run my COMSOL model multiple times in a loop in MATLAB with different initial and boundary conditions. I was just wondering if it would be possible to set the initial...

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Heat Source in Turbulent High mach number flow !

Dear COMSOLERS ; I am trying to simulate an electric arc in a flowing gas through a nozzle. as you can see in the attached model, the arc heat is been added as a heat source in the hmnf interface. also...

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Moving Mesh issue at the inlet/outlet

Hello, I am working on a 2D model on a channel with some obstacles. The study is time-dependent and I have used the Moving Mesh (ALE). The lower boundary of my model is moving down. The inlet and the...

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Plasma plume expansion induced during laser ablation

Hello, We are trying are to set up a model to study plasma plume expansion induced during pulsed laser deposition. Model is based on compressible Navier stokes equations consisting of mass, momentum...

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Rotary woofer simulation

Hello. I am trying to simulate this recently developed rotary woofer:www.rotarywoofer.com/www.jpark.us/pubs/JASA_125(4)_RotaryWoofer_2009.pdf My main goals are to find out air flux and energy flux...

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how to use two boundary conditions at same boundary

I have been solving darcy's module in which i am supposed to add BCS of inlet pressure as well as mass flux which is at same boundary. But when i add 1 boundary condition it gets overridden by another...

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Energy balance with variable density

Hello everyone, I am interested in finding the temperature in a system that changes the density in time and I would like to formulate the energy balance using this variable density. What I have in mind...

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Modify continuity on internal bounderies

Hi everyone, I have some doubts about how to modify continuity condition on internal boundaries and I would ask for some help. I want to solve hydrodynamics on a unit cell of the Taylor flow (known...

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About check the fluid setting

Hello when i calculate the fluid model where and How could i know the Reynolds number and Stokes number?

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Boundary condition

How to impose perfect contact (equal displcaement) between internal boundaries of different surface (resin-mold interface).

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Defining a variable limited only for the boundary

Can we define a dependent variable for a physics which is only valid for particular boundary and not for the whole domain?

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cone-jet mode in electrostatic field

Hi, Here is my problem. I want to simulate a electrohydrodynamic (EHD) phenomenone , a nozzle with full water (or electrolyte) in a electrostatic field, the the water is polarized and deformed the...

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Form assembly or Form union

Dear All, I encountered a problem when I models fluid flow through conduit surrounded by solids at two sides. The models involves laminar flow module and structure module. According to the description...

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Warning: SOR line did not find any lines.

Hi everyone, I am running a laminar two-phase flow (level set) simulation with a 3D geometry. I had previously simulated the same geometry in 2D with the same initial values and boundary conditions and...

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How to add a mass source term to NS equation

Hello everyone I have a problem in adding a mass source term to the NS equation. I use it to account the mass loss due to vaporization during laser melting process. Currently I use the interface moving...

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serval questions of heat transfer in my project

Hello As the figure shows, I am using the fllowing models (Heat Transfer>Conjugate Heat Transfer>Laminar Flow Stationary situation Surface-to-Surface Radiation), and try to find the temperature...

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Gas mixture flow simulation

Hi everybody, Gas 1 is flowing in my geometry (a round pipe) and I want to inject gas 2 into the flow. My idea was to assign both gases to the same geometry (using pipe flow module twice) and then use...

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Matrix has zero on diagonal

I have to solve a lid driven cavity (laminar flow) + melting problem (heat transfer in fluids and solids with moving mesh). I was able to successfully implement this in 2D. I have now shifted to a 3D...

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