Induction and Joule Heating coupling within a Conjugate Heat Transfer problem...
Hello everyone! Having still a lot to learn in COMSOL, recently I've been trying to build the following setting: a transformer (consisting of a three-column laminated steel core with the windings fixed...
View ArticleVortex Tube Analysis
I am new to comsol. I am using ansys fluent. to analysis vortex tube in fluent there is an option called swirl dominant flow under k-epsilon. is there any option in comsol like this -- quiting is not...
View ArticleMoving mesh following the structural deformation
I am using a piezoelectric membrane to move the fluid. Can anybody help me to make the moving mesh follows the structural deformation of the membrane, please?
View ArticleHeat Transfer - flow
Greetings. I have a Heat transfer modelled, which I'd like to couple to a fluid laminar flow. I would like to give the flow inlet and outlet conditions on imaginary surfaces on either side of the...
View ArticleDirect- Fully Coupled Solver [Strange Behavior]
Dear All I´m working on a Natural Convection Tower model. It has the Heat Transfer and Low Re K-e CFD interfaces. And I am using Time Dependent, Direct Fully Coupled method. I undestand that reciprocal...
View ArticleFailed to find consistent initial values
Dear all: I am trying to couple two phase flow and structure mechanics together. In case of generating the huge gap between the initial condition and boundary load ( also inlet), I have already include...
View ArticleCalculate Torque from Shear stress in laminar flow 3D
Hi, I'm trying to calculate the torque on an object that is rotating at steady state inside a fluid. I'd like to check here if I'm doing it right. I have a 3D model with symmetry in xy plane. Rotation...
View ArticleTaking induced Piezoelectric force and apply it to FSI physics.
HI all, Can you help me to know how to apply the Piezoelectric induced forces getting from solid mechanics physics and apply it to FSI boundaries above it? how can I link between PZT actuator to an...
View ArticlePrescribed compression of fluid
Hi, I have a very simple model, consisting of a 1 x 1 m^2 square which is filled with Air. I know that this problem can be solved by assuming ideal gas, and computing the area of the deformed domain....
View ArticleCalculate the thermal gain of fluid
Hi we are modelling a fluid across of pipe, inner the pipe the fluid recive a heat flux from a solid, when i calculate the energy gain of fluid =m*Cp*AT is higher than the global evaluation of heat...
View ArticleFailed to find consistent initial values
Dear COMSOL users! I am trying to model wormhole formation during the acid injection in the reservoir. It is two scale model: Darcy scale and pore scale. I am using 3 physics: Darcy law, transport of...
View Articlequestion about the inertial term expression in Navier-Stokes equation
Hi all, I have a question about the inertial term expression in COMSOL. As we know, the inertial term in Navier-Stokes equation is rho*u*del(u), rho is density, u is velocity vector. While in COMSOL,...
View Articlehow to solve this error in my electrowetting case?
I built an electrowetting model. But when I compute it, it had some error like this: Repeated error test failures. May have reached a singularity. Last time step is not converged. Does anyone have a...
View ArticleMaking a 2D velocity plot from a 3D geometry.
I have solved a 3D CFD model and I wish to have 2D plot of the velocity along the geometry height at a certain point inside the geometry. How can I do that? I appreciate your help.
View ArticleLaminar Flow in nanopore
I'm new to comsol simulations. Whenever I simulate my results with just PNP equations (Electrostatics and transport of diluted species modules) my results are fine. When I add the laminar flow module...
View ArticleHow to define the boundary conditions for oscillatory flow in COMSOL?
Hi I want to model an oscillatory flow passing fins inside a resonator. I need to define both of the velocity and pressure boundary conditions at the inlet (x1) and the outlet (x2) of the computational...
View Articleweak constraint or pointwise constraint
Hello, I would like to have ur opinion for this situation: I wish to constraint the (fluctuating) pressure to an average value of 20 [constraint expression: aveop1(p)-20] at the inlet boundary while...
View ArticleApplication of Boundary condition with thermal resistance.
Hello everyone, I am trying to build a model in which I do not have the values of thermal conductivity or thermal convection between the fluid layers, but I don not want to consider them and I only...
View ArticleImposing pressure and velocity continue boundary conditions
Hi I am building a model to understand fluid flow inside a porous medium. I have a thin film on liquid which is being absorbed into the porous medium. The liquid film is a free boundary and flows by...
View ArticleEuler-Euler model
Are there any euler-euler tutorials for Comsol 5.2a? I try to set up some test cases, bu I have difficulties with the boundary conditions
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