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Underrelaxation of pressure correction equation

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Old   April 15, 2016, 18:58
Lightbulb Underrelaxation of pressure correction equation
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Jan
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Hallo.

When I want to underrelax the pressure equation by the underrelaxation factor lambda, I'm changing the central coefficient aC of the matrix to:

aC --> aC/Lambda

and the right hand side to

b --> b + (1.0 - Lambda) * (aC / Lambda) * p_0

with p_0 is the solution of the last iteration.

For p_0 do I have to use:
- the old pressure value p_0
- the old pressure correction value (p_0 / Lambda)
- 0 Pa as it is a fractional step scheme

Thank you in advance.

Jan
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