modeling a reactor with heat exchange [syngas]
Hello, Actually I am doing a university project where we need to modelize a reactor for the reaction of syngas and our teacher asked if we could make three different levels of complexity • First of...
View Articlecoupling two phase laminar flow and heat transfer in fluids
Hi guys, I have serious convergence problem in my case of two phase laminar flow and heat transfer in fluids. It is not a big deal. Just a box with inlet and oulet - for the flow - and one temperature...
View ArticleSurface vorticity plot with angle
I am new to COMSOL. I am trying to analyze flow past a 3D sphere in steady , laminar flow case.After finding the result I am able to draw velocity and vorticity streamlines , pressure and vorticity...
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 Articleerror in time dependent study
hello for study: range(35,0.1,95) i am getting error: Failed to find consistent initial values. Segregated Step 2 Attempt to evaluate real square root of negative number. Function: sqrt Failed to...
View ArticleError : Failed to find consistent initial values
Hi, I have made a 3D EHL model using Thin-Film Flow, Shell and Solid Mechanics. When computing the model, the following error is popping:"Failed to find consistent initial values" Maybe this error is...
View ArticleCoupling for heat source term from reaction enggineering.
Hi; I am trayign to simulate chemical reactor. I have created the following models: 1- mod1: reaction enggineering only 2- mod2: mod1 is syncronized with multiphysics having Laminar flow, Heat...
View ArticleJoule Heating in changed gas presser (in vacuum)
Hello! I have such problem. Electrical conductor connected to a DC power source. Placed in the rarefied gas. It is necessary to see change temperature conductor, depending on the gas pressure. I have...
View ArticleLiquid-Vapor interface drops very fast
Hi I have encountered a problem in COMSOL when using the “laminar two-phase flow, moving mesh” physic. A simple model indicating what I am trying to solve is provided in the attachment. As you can see...
View Articlemoving body in a fluid domain
Hello I want to visualize the pressure variation on a solid in a predefined motion within a steady fluid(air) domain, and also see the variation of fluid around the solid body. I am using the FSI...
View ArticleFlow without a channel (outlet)
I am having trouble modeling a flow in which there is no defined outlet. For example, imagine 2 hair dryers perpendicular to each other blowing air to a plate. There is an inlet, hair dryer's nozzle,...
View ArticleError using optimization module
I tried to simulate a forced convective heat transfer problem: water flow through a heat sink. When I did stationary study with initial values of optimization parameters, it ran well. But if I ran...
View ArticleCOmsol - Matlab Variable linking.
Hi all, I am Looping simulations over matlab with different sets of values matlab calculates. I am looking for changing the variable values. I have found for Parameter as model.param.set() for changing...
View ArticleHow to Define a nonlinear elasticity Model In Comsol 4.0?
Dear Dr. Ivar, I want to use a nonlinear Elastic relationship called "Duncan-Chang Model " for building a model about soil deformation. I use "Linear Elastic Material Model", and fill the parameters E...
View ArticleMatrix has zero on diagonal
Hi experts, I mat a problem when simulate a AC/DC model. it came out as below: Failed to find a solution for the initial parameter. Segregated group1 Matrix has zero on diagonal. Returned solution is...
View ArticleElliptical cylinder
I am completely new to comsol, so please forgive me for posting a problem I suspect have a simple solution. I have tried to search for a solution myself, unsuccessfully. In a microfluidic problem I...
View Articledisplay probleme
is there any one how can help me because I have comsol5.0 where subtly the display region is not very clear even for the drawing model and results display. Thank in advance
View ArticleHow can i solve the problem of natural convection? and coupling of physicis?
Hi all. I want to analyze a heat sink in natural convection. I gave Temperature under the heat sink(80 degC), outside open boundary and volume force. when I pushed study, I have a problem. That is...
View Articletwo phase laminar flow in 3d
hi I m supposed to simulate two-phase laminar flow problem (moving mesh). the size of a cyl is , r=5 h=5 The bottom of the cylinder is fixed and the top of the cylinder is moving with a certain speed...
View ArticleMass conservation in closed fluid system
Hi Community, I am using a Rotating Machinery, Laminar Flow, Frozen Rotor setup to simulate the liquid flow in a cylindrical container with a magnetic stirrer. To test the accuracy of my model I wanted...
View Article