how to set periodic flow boundary conditions
Hi, As showed in the picture, I want to achieve the periodic flow the vertical direction, also I need to set the inlet as a time-dependent velocity boundary and outlet as a pressure boudary. Can anyone...
View ArticleDeformed geometry and prescribed velocity
Goodmorning to everyone, I'm new, and I'm facing a problem with deformed geometry. I want to deform a liquid domain under a defined velocity V that acts normal to the upper boundary of the domain, and...
View ArticleSimulation of Water-Toluene Slug flow in milliscale channel
Hello everyone, I am trying to simulate slug flow pattern using a T junction(6mm in diameter, made of quartz glass) with Water and Toluene. I have added input conditions as per a research paper but...
View ArticleHeating, ventilation and air conditioning (HVAC)
I try to model an HVAC system for automotive applications for full electric cars that have scroll compressor. I'm interested in cabin heating graphic to make some comparison whit another simulations...
View ArticleDensity error in transport of concentrated species
When I perform AC frequency perturbation simulation in comsol I encounter this problem: In transport of concentrated species the value of density of the compound is evaluated with respect to only 1 of...
View Articletwo phase analysis of a bubble of air in water
Hi, I have created a model (see attached) with an air bubble size 8mm in diameter inside a cube of water 17.5mm in size. this analysis converges. When I create the same analysis but in um (meaning air...
View ArticlePlotting Electric field gradient for studying the effect of DEP
I have an experimental FEM prepared for Electrophoresis and DEP study. I am primarily using the Electrostatics module, Microfluidics module as of now. I have explored the DEP module too, but i believe...
View ArticleProbing several boundaries
Dear community, I have a cuboid with laminar inlet. Now I want to observe the development of pressure and velocity on one of my upper surface. To implement that I created a workplane in Geometry with...
View ArticleMixed variable boundary conditions
I have two coupled partial differential equations with two dependent variables u(x,y) and v(x,y) to solve. I have a boundary condition with mixed variables u(x,1)+v(x,1)=16. How can I impose such...
View ArticleAveraging and Quantifying a Dependent Variable in a 2D Domain along One Axis
I am solving a pde problem in a 2D domain, the dependent variable is phi. My goal is to determine quantitatively the region in the 2D domain that the average of phi along the vertical direction reaches...
View ArticleInlet and outlet boundary condition of fluid flow
I am new to Comsol simulation. I am trying to simulate fluid flow in porous material. The fluid gets accumulated in porous material. Only known volume of fluid is available at inlet reservoir like 5...
View ArticleDoes Comsol allow only continuous flow ?
Is it possible only to simulate continuous flow in Comsol multiphysics where the liquid is available at the inlet continuously and it leaves at the outlet? How to give the boundary conditions where the...
View ArticleHow to model 2D Fluid Structure Interaction FSI - Symmetrical Model of Human...
Hello Community! Currently I'm working on a 2D symmetrical model of human vocal folds. The problem is very similar to that presented within the FSI tutorial (Application ID: 361). The differences are:...
View Article2 solutions mixing in Micromixer
Dear all I would like to simulate the mixing efficiency of my Pulsatile micromixer. I have read and tried to practice with many tutorial libraries but I got confuse a little. By using "Fluid Flow...
View ArticleValve closure for water-hammer effect with interpolation function
Hello, Comsol has provided a water hammer benchmark problem for a 20 m long piping. This is solved using Water-hammer module. This module gives a pre-defined boundary condition 'Closed' and selects the...
View ArticleConvergence, time-dependent study
Hi everyone, I'm doing a time-dependent with phase inicialization study of Laminar two-phase flow, level set.. As you can see in the attach file the reciprocal of step size is increasing (very slowly)...
View ArticleCoupling transport of a species to surface reactions
Hello, I am trying to make a model that has laminar flow, transport of a dilute species, and surface reactions. I want the laminar flow and transport of a dilute species to distribute the chemical...
View ArticleEvaluate mass flow rate needed to remove a certain heat flux
Hi, I'm trying to solve the following problem: I have a 3D model of a box of stainless steel, with an electrical resistance on the top wall and an insulant material all around the box. At the bottom is...
View ArticleCreate Diagram of progress of additional variables like forces during solving...
Dear COMSOL Users, I am new using COMSOL CFD-Module but made experience with CFD Software like ANSYS CFD or OpenFOAM in my past. Most times I use CFD to calculate flow and forces in valves. The...
View ArticleHow can I couple 2 temperatures in different physics!?
Hi How can I couple 2 temperatures in different physics!? I have laminar flow and heat transfer in fluids Modules and one extra PDE Eqn. I want to have the same Temperature in both PDE and Heat...
View Article