Fluid Flow in U-loop
Hi everyone, I have modelled a U-loop with water flowing through inside in 3D, with three different sections (two cylindrical lines and one half of a torus at the bottom). But COMSOL only calculates...
View ArticleRunning FSI examples, "undefined value found"
Hi!, i am trying to run an fluid-structure example with use of the MEMS module, byt anytime i get the error "undefined value found..." for the variable mod1.v_solid. So i even downloaded the 2d fsi...
View Article3D geometry imported mesh
hello Saeid, sorry for the later response. was on holiday for about a month. i am using COMSOL 4.3a. i just checked with my computer. It's possible to follow...
View Articlesloshing tank problem with solid structure
Hi all, I was trying several to do the "sloshing_tank" model with container which is elastic material. when I add the container with the sloshing_tank geometry, the free fluid surface did not show- as...
View ArticleHow to assign different values to dependent variables
Hi, I am just wondering that how it is possible to assign optional values to the dependent variable in some part of the domain ? I always get "Duplicate variable error". Actually I am trying to put...
View ArticleOne way coupling- A reasonable approximation?
In the tutorial for FSI in a network of blood vessels, it has been narrated at the end in the results and discussion section for Figure 5. " The displacements are in the order of 10um, which suggest...
View Article3D laminer vortex
hi, I am simulating a block which filled in water, and there is a cylinder prevent the water the block.(the diameter of the cylinder is smaller than the block) I am using laminer flow and hoping to see...
View ArticleError about 'Failed to find consistent initial values. Last time step is not...
Hi, I am a new user of COMSOL. I've set up my reactor geometry model and successfully applied the turbulent flow (stationary condition) in my reactor model. However, when I try to simulate my reactor...
View ArticleProlonged error with "Last Time Step Not Converged"
Dear sir, We were trying out "PIPE FLOW MODULE" as you have suggested. And thanks for the advice, as it has reduced the number of mesh elements to a larger extent. But, we were getting a consistent...
View ArticleSingle phase flow with heat transfer in vertical tube
Hi, Actually, i am trying to model two phase flow in vertical tube. So, as I am new in COMSOL, i AM STARTING WITH SINGLE PHASE FLOW WITH HEAT TRANSFER IN VERTICAL TUBE. for LAMINAR FLOW my MODEL IS...
View ArticleError with the laminar flow inlet in plasma simulations
Hello! Using the laminar flow for plasma processes I have had some errors when the section of the inlet is small. I am trying to simulate a chamber where the inlet section has a radius of 0.0025 m, so...
View ArticleHow can I find the flow velocity of a specific coordinate point
Dear all, I would like to ask how can I find the flow velocity of a specific point (x=105, y=2.5) in my channel (it is shown in the picture). In the graph, if I click at any random point I got 3...
View ArticleFluid flow channel in cantilever beam
Hello, My model is the following: a cantilever beam has one longitudinal channel containing a fluid flow. My goal is to find the effects of the fluid flow (viscosity, velocity, size of the channel) on...
View ArticleVelocity gradient expression in 2D-axisymmetric
Hello, the velocity gradient tensor for a 2D-axisymmetric problem presents, for the phiphi component, the following expression chns.graduDGphiphi = if(abs(r)<0.0010*h,d(u,r),u/r) does anyone know...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
View ArticleSurface evaporation, condensation
Hi, I want to model surface evaporation from a water flow at 40 Celsius and observe the consequent condensation on a cold surface. Can you help me with the model that I should use? I could not find...
View ArticleHow to find temperature variation for a single element in my model
My model has 7 elements as a whole. I am able to plot the temperature variations of the whole model but not for any separate element in the model. I request if somebody helps me know how to plot the...
View Articleold model cannot be reconstructed....
I am attempting to build on a model using Darcy's law to model solute transport under saturated conditions. The original model was built in COMSOL 3.5a, and I get an error message "Old model cannot be...
View ArticleVelocity gradient expression in 2D-axisymmetric
Hello, the velocity gradient tensor for a 2D-axisymmetric problem presents, for the phiphi component, the following expression chns.graduDGphiphi = if(abs(r)<0.0010*h,d(u,r),u/r) does anyone know...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
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