Deflection of thin PDMS membrane versus time for a constant and uniform...
Hi,I am really new to COMSOL. I am trying to calculate how the deflection, due to uniform pressure load, of a thin PDMS rectangular membrane fixed at the edges, increases with time until it reaches the...
View ArticleMoving mesh method to simulate laser material interaction
Hello,I am working on the laser material interaction using moving mesh method. I want to study the effects of recoil pressure and other forces (normal and tangential surface forces ) acting on the...
View Articlemodel crashed by Failed to evaluate temporary symbolic derivative variable
Hi there,I used the two coupled PDEs (one is for moisture flow and another one is heat transfer) to simulate water flow, heat transfer and phase change in the frozen soil. At the beginning, the...
View ArticleTwo way FSI solver-- a piston push fluid through cylinders and small gaps
I want do a simulation in two way FSI, a piston pushing fluid through cyliners and small gaps. I have try to use different solvers of Time dependency. It is always the Error " Failed to find consistent...
View ArticleClik here to view.
Implementatation of Neuman boundary conditions
Dear all. I am solving naveir Stokes equations for elliptical shape bubble flow in fluid. I applied my neuman boundary conditions and I got equations in which the the Neuman BC in weak form (equation...
View ArticleHow to define a PDE form of a source term including an unknown variable in...
Hello everyone,My problem include "free flow" and "porous flow" domains for which I am going to consider transport of chemical species. In the convection-diffusion equation for the porous flow, The...
View Articleweak form pde
Hi all. Please can some one give an example, how we can write a pde in weak form which have three dependent variables. I do not know how I can write the stokes equations in weak form using comsol. The...
View ArticleWeak form PDE in comsol
Hi. I studied the blog for applying the neuman boundary contion in one dimension. The blog link is https://cn.comsol.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/but i am facing problem...
View ArticleRadiation in participation media and LTNE - an energy balance problem
Hello everyone,I have a model of porous media (with local thermal non-equilibrium) attached to a solid domain. I am considering porous media as a participating medium using P1 approximation. But I have...
View ArticleWeak form of Naveir Stokes equations in COMSOL.
If a physical model is not listed in the wizard, we can use Comsol's weak form to enter PDE's (governing equations of a system) in their weak form. How can it be done ?for example: 2 equations of...
View ArticleShell and tube heat exchanger simulation problem
Dear all,I'm simulating a heat exchanger with some of the tubes plugged within it.I have 19 tubes within the heat exchanger.When I 18 of 19 tubes, at different locations, I get the simulation done, But...
View Articlestoring one variable only
Dear all, I have a model with 3 variables of T, P and v. what is the best way of only storing T in solutions to save on size? do I need to do it via batch mode? I dont have COMSOL with matlab so...
View ArticleSqueezing tube peristaltic pump: sliding roller along lenght of the tube
Good evening, I'm trying to simulate peristaltic pump working with fluid structure interaction module in 2D geometry. I have obtained the first deformation promoting the squeeze of the tube with...
View ArticleRayleigh-Plesset simulation
Hi all,I am in the process of modelling some microbubble-microchannel acoustic behaviour.During this process, I am trying to check (before going into massive files) that the gas (air) bubble follows...
View ArticleProblems in Velocity profile (Laminar flow).
Hello everyone, I'm working on fluid dynamical model with considering Laminar flow and Heat transfer in fluid model physics. While setting the initial velocity = 0 [m/s] and initial pressure = 0 [atm]...
View ArticleReduce flow rate when specified max pressure reached at inlet
Dear All,I would like to have reductions of flow rate whenever specified max pressure reached over time. At inlet boundary, the flow rate starts with 0.25 [gal/min]. Afterwards, the inlet pressure...
View ArticleDefining a domain within an imported SolidWorks part
Hi,I have a SolidWorks part which has holes for tubing in it. When I complete the laminar flow physics, the flow is going through the whole part instead of the holes where the tubing is. How do I...
View ArticleCap faces
Hi,I have a geometry that I imported from SolidWorks and am trying to use the cap faces feature, but the defeaturing and repair option is not available to me. I'm not able to attach the file, even...
View ArticleWeak constraints on air liquid interface
I need you sincere comments and suggissions on the attached mph file. Actually, I am simulating the bubble motion in fluid flow using comsol. I am almost sure that my model is okay, but the problem is...
View ArticleAutomatic Remeshing errors
Can someone know the error given by COMSOL. Will be great if point out. - - - Feature: Automatic Remeshing (sol1/t1/arDef) - Feature: Time-Dependent Solver 1 (sol1/t1) Failed to find consistent initial...
View Article