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Forum: Main CFD Forum

April 29, 2016, 10:52

Replies: 16

How to fix / solve local instability

Views: 1,015

Posted By arjun

What solver are you using btw. Decreasing...

What solver are you using btw.

Decreasing time step may introduce decoupling of pressure and velocity as it weakens the Rhie and Chow dissipation.

Forum: Main CFD Forum

April 29, 2016, 10:43

Replies: 16

How to fix / solve local instability

Views: 1,015

Posted By arjun

For incompressible flow pressure urf of 1 is too...

For incompressible flow pressure urf of 1 is too high, I would hesitate to try above 0.3 usually.

Only in pressure based coupled solver that i have i use p urf around 0.9

Forum: Main CFD Forum

April 29, 2016, 10:42

Replies: 16

How to fix / solve local instability

Views: 1,015

Posted By arjun

I think what he means is that wiggle appears but...

I think what he means is that wiggle appears but solver is able to recover from it.
Instability is some disturbance that keep growing until solver blows up the residuals.

The issue is that...

Forum: Main CFD Forum

April 29, 2016, 08:28

Replies: 16

How to fix / solve local instability

Views: 1,015

Posted By arjun

Could you check if you have reversed flow at this...

Could you check if you have reversed flow at this point of problem.

This information is important before any judgement be made because i know one way it could arise in case of reversed flow.

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