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Factors for Convergence
Posted Jul 15, 2015, 2:33 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD), Porous Media Flow 1 Reply
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hi
I am solving a time-dependent problem on flow through porous media using two phase darcy law. I want to know whether the time range for the study affects the flow or convergence of the solution. According to what I know, only the time step size affects the solution or convergence. But in my problem the flow is good and converged if I solve it for a particular time, but if I increase or decrease the time the solution is not good as well as its not converging. I have also attached the file for your reference.
Hope, some would be able to address my concern and also indicate the factors affecting the convergence of the solution.
Thanks.
Regards
Bachchan
I am solving a time-dependent problem on flow through porous media using two phase darcy law. I want to know whether the time range for the study affects the flow or convergence of the solution. According to what I know, only the time step size affects the solution or convergence. But in my problem the flow is good and converged if I solve it for a particular time, but if I increase or decrease the time the solution is not good as well as its not converging. I have also attached the file for your reference.
Hope, some would be able to address my concern and also indicate the factors affecting the convergence of the solution.
Thanks.
Regards
Bachchan
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1 Reply Last Post Jul 21, 2015, 11:31 a.m. EDT
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Posted:
9 years ago
Hi Bachchan:
At the outlet boundary, is the resin flowing out or is it constrained inside the L-shaped container? I think the problem is your outlet boundary condition is allowing the resin to flow out and after a certain point, the simulation wants to fill up the L-shaped container with air and push out all the resin. Can you change the boundary condition so that you specify the saturation level at the exit?
Sri
At the outlet boundary, is the resin flowing out or is it constrained inside the L-shaped container? I think the problem is your outlet boundary condition is allowing the resin to flow out and after a certain point, the simulation wants to fill up the L-shaped container with air and push out all the resin. Can you change the boundary condition so that you specify the saturation level at the exit?
Sri