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Old   July 9, 2007, 07:11
Default Relaxation and Solver Parameters
  #1
norbinou
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Hi,

I want to now if the the number of sweeps and Residual tolerance a causes for divergance (work with Star-CD 3.26)

thanks,
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Old   August 6, 2007, 06:34
Default Re: Relaxation and Solver Parameters
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pankaj saha
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plz, can u tell, when we are using modified MAC method and solving 3d-channel turbulent flow. 1. should we use underrelax or overrelax. 2. what should be the continuity satisfying limit. 3. what shoul be the inlet velocity profile and initial condition for tha channel for turbulent flow simulation.

this is rectangular channel.
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Old   August 21, 2007, 18:46
Default Re: Relaxation and Solver Parameters
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pankaj saha
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hi,

actually i am not using any software...i wrote a code in fortran using SMAC solver./

so, can u plz help me to ans my question in pretext to code not in softre...
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Old   September 25, 2007, 02:38
Default Re: Relaxation and Solver Parameters
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norbinou
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I use underrelax 1E-04, think you should underrelax. If you have a rectangular profile, i think you should use rectangular profile @ initial velocity.

So I think you need to do that, an after you can see, if the result is correct or no, you can calculate maybe the pressure drop, an look in significant or not.

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