Chemical Forum

 Retrieve Password
 Register Now
!show!: 77|Reply: 1

PISO for high Courant Numbers [Copy URL]

Rank: 8Rank: 8

Post time 2012-12-15 08:35:34 |Show all posts

1) Can PISO be used in transient simulations with a high Courant Numbers (say, >20)?

2) Can it be stable (with a lot of inner iterations -> is that all I need)?

3) is it more stable than SIMPLE for these cases (transient, but with a high Courant)?

4) good references?

Thanks a lot.


Use magic Report

Rank: 8Rank: 8

Post time 2012-12-15 08:35:39 |Show all posts

Hi,

The original version of PISO was developed for transient calculation with small timesteps, so you have also small Courant numbers (<1) in this non-iterative variant. If you are running PISO like SIMPLE with outer Iterations you do not need small Courant numbers, but the convergence rate of PISO will then not be better or faster than SIMPLE! See also the paper "Solution of the implicitly discretised fluid flow euqations by operator splitting" by R.I. Issa!

Good Luck!

Use magic Report

You have to log in before you can reply Login | Register Now

Archiver|Chemical Forum

GMT+8, 2014-7-24 10:17 , Processed in 0.061708 second(s), 10 queries .

Powered by chemical forum

Top