problem in convergence

shaswat · February 20, 2012, 00:15

Dear friend

I am doing blood flow through stenosed artery. I consider the arterial wall as porous domain
wall has multiple layers which has different porosity and permeability

I have written permeabity and porosity as a function of r

it is steady state analysis. I am facing the convergence problem .I need your help

Thank you

Regards

Shashwat

ghorrocks · February 20, 2012, 00:52

Use a much smaller timestep to start off, and possibly local time scale factor (set it to about 5). Run that for a while until it starts to converge, then switch back to physical time scale with a larger time step to convergence.

These are all standard tricks for getting convergence, read the documentaton on "Obtaining Convergence".

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February 20, 2012, 00:52		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,934 Rep Power: 145	Use a much smaller timestep to start off, and possibly local time scale factor (set it to about 5). Run that for a while until it starts to converge, then switch back to physical time scale with a larger time step to convergence. These are all standard tricks for getting convergence, read the documentaton on "Obtaining Convergence".