Carreau or Carreau-Yasuda model
Hi, Is there an easy way to use the more general CY model in COMSOL 5 rather than the carreau model?
View ArticleThermal expansion effects of the gas inside the MEMS pressure sensor
Hi, I want to simulate the thermal expansion effects of the gas inside the MEMS pressure sensor. What should I do in the case of the MEMS capacitive pressure sensor tutorial example. Thanks a lot
View ArticleAsk for help
Who has the case of magnetic liquid flow in the magnetic field, or in case of case names can also be.thank you
View ArticleError: Cannot evaluate expression
Hi all, I keep getting this error when trying to compute the study on heat transfer: Failed to evaluate variable. -Variable: mod1.nitf.U -Geometry: 1 -Domain: 3 Failed to evaluate expression....
View ArticleLow Mach number flows in COMSOL
Hello all, I am looking to model flow in a combustion chamber where the flow is compressible because of the temperature variations and not due to pressure. The Mach number <0.3. Numerical solution...
View ArticleDerivative of Normal on a Surface
Hello. Any help would be greatly appreciated. I am trying to calculate the mean curvature on a boundary. To do this, I am trying to calculate the dot product of the surface gradient operator and the...
View ArticleFailed to find consistent initial values. Last time step is not converged.
Hi I'm trying to solve a time dependent heat transfer problem coupled with a stationary laminar flow problem. When I make a time-dependent study (see study 2 in my file), it always shows that error. I...
View ArticleDrag Coeficcient vs Reynolds and Lift Coefficient vs Reynolds
I would like to plot Drag Coeficcient vs Reynolds and Lift Coefficient vs Reynolds for a laminar flow past a cilynder that is rotating. I am using the comand "reacf(u) and reacf(v)". But I really don't...
View ArticleFlow velocity profile in a microchannel
Hi All, I would like to see the velocity profile in a microchannel for laminar flows. I used laminar flow in microfluidic module but unable to see the velocity profile. Does anyone know how to do it?...
View ArticleFluid-Structure Interaction In a Cylinder
Hi EveryBody; I recently heard about Fluid-Structure Interaction, so i want a model with this Physical module in a cylinder if it's possible. i also want to know if there is a difference between the...
View ArticleBoundary Conditions: Pressure head vs. Pervious Layer
We are creating a 2D, steady state, Darcy model of a clayey embankment acting as a dam with a sand foundation. Upstream of the dam is at a higher water level then downstream, both are constant. A...
View ArticleCoefficient of isotropic diffusion in icp_torch model
Hello, I have one question to the developers of icp_torch model of PLasma module- Equlibrium discharges. What does mean the isotropic diffusion coefficient in this model in main laminar flow settings...
View ArticleFree Convection: Stationary or Time-Dependent Study
Dear all, So far in all my free convection simulations I have used Time-Dependent Study but it takes a lot of time, weeks and even months to get the results. The point is I am not interested in...
View ArticleProblem with transport of diluted species mass conservation
Dear Comsol Community, My model is a 2d axisymmetric geometry, composed by one fluid layer and many porous layers. I'm modeling both laminar flow and transport of diluted species. This chemical species...
View ArticleSessile droplet
I want to put a sessile droplet inside a channel. How to create a droplet of a specific material ? and how do I choose the model ? As a reference I was wondering about the model in one the Paper - A...
View ArticleHow to add a force equation
Hi, everyone I want to know if there's a way to define my own force equation for particle tracing. The forces on the particle tracing are predefined; every time I change the equations, they just go...
View ArticleWhat is difference between darcy and brinkman eqn.?
I know darcy and brinkman eqn. are uesd in porous media flow. I heard that darcy is used in small porosity media flow but, brinkman is used in the opposite case. Is that right? If that is right, Is...
View ArticleCoupling Two-Phase Laminar Flow & Moving Mesh physics
Dear Comsol community, I'm trying to model a flow of water in air. The flow is created by a moving wall (like in a syringe). The wall is moving at a speed of 1 mm/s. All the dimensions on the GIF file...
View Article3D Helix Laminar flow, heat transfer in fluids and heat transfer in solids
Hello, I need help with the Solving method, I'm trying to solve a 3D problem with three multiphysics, my geometry have two domains. Somebody now the difference between the direct model and the...
View ArticleDifine Herschel-bulkley parameters
Hi I'm trying to understand how can i define shear stress parameters for Herschel-bulkley model in Comsol 4.2a The stress expression for this model is: stress = yield stress+m*(shear rate)^n Any...
View Article