Re: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Hi Alessandro, I am trying some similar model and I get the same error as you. If I try the laminar model it works (at least up to some time), but when I try the turbulent k-eps model I get the same...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Hi. I am also facing the same problem on Comsol 4.0. I am trying to solve unsteady fluid flow in a pipe with heat transfer, with constant inlet velocity. When I solve using laminar model or with steady...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Is it Really matter form where we are starting ? Because It is given the option to witch over from stationary to time dependent and vice versa . I am also facing the same problem as described above....
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Hi, I am having a lot of problems with turbulent flow too but I have been trying to simulate something similar to what you said and it works. Could you please post your model?
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Some observations: 1) Your inlet velocity needs to be multiplied to a smoothly increasing function like 'step' so that the software can begin to solve from a 0 value and then reach a solution. 2) Your...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Thanks for your prompt response. Please note that : 1.Your first point is not clear regarding which step or what should be multiplied 2.First i was working on turbulent flow but not getting the right...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Thanks for your prompt response. Please note that : 1.Your first point is not clear regarding which step or what should be multiplied 2.First i was working on turbulent flow but not getting the right...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
1) in the Inlet node you are prompted to choose a type of boundary condition, if you choose velocity then you must write down the value/expression of the velocity. That very value/expression must be...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
I have made the necessary changes in the model attached below. Please check it . I am here explaining you the whole problem: A producer gs is flowing with a flow rate of 11.76m/s through a small inlet...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
In the model you attached there is no trace of what you wrote. However, I think I can gather what you did. Let us go over the instructions again: 1) right click on the Definitions node and select...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Thanks again , Could you please share you contact detail or add me on skype : ishantj or gtalk : ishantmiet@gmail.com Ishant In the model you attached there is no trace of what you wrote. However, I...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
I have searched for the mid-point and smoothening in documentation still not been able to get their significance into the same. Please see the attached model : Now it is showing error as: Segregated...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
It would be kind favor if you please respond asap. Ishant
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Dear Friend, My problem is almost solved , need a small help. Please find attached is the model and try to run it : the error this time is segregated group. Please respond asap. Ishant. I have searched...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Hi An advice if you turn off the "repeat message" the threads are easier to understand, in my view ;) I had a quick look at your model: 1) you have no velocity at inlet (probably selected/changed the...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
hey i am trying to simulate turbulent open channel flow. but every time it shows an error " Failed to find a solution. Maximum number of segregated iterations reached. Returned solution is not...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Go to study >> Solver >> Segregated Increase the number of iteration. -- ishant.jain@tatasteel.com
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
hey i incerased the no. of iterations as specified but this time it shows different error."Failed to find a solution: In segregated group 1: Very ill-conditioned preconditioner. The relative residual...
View ArticleRe: [Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Dear friend, I have been having the both same problems in my model than you. I see that it was a long time ago however, I would like to know if you could solve the problem. Regards
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