|
[Sponsors] |
November 27, 2003, 19:01 |
Rhie - Chow Interpolation ?
|
#1 |
Guest
Posts: n/a
|
I have been writting a 1D CFD code for solving the Navier Stokes Eqs. I have found that the Rhie - Chow interpolation takes to many iteration to get a good convergence (i.e. Mass error < 1.0E-12). A have modified the relaxation factors for velocity and pressure, within the range of 0.8-0.5 for velocity and 0.5-0.1 for pressure, having almost the same results. I am using a SIMPLE algorithm, with a direct solver (1D - TDMA).
I actually test the code with a very simple problem (viscosity = 1.0E-3, density = 1000.0, dx = 100 * 50 CV, Area = 1.0E-4, every thing in IU, Re = 1000). Although, I have a good rate of convergence at begin of the iterations (e.g. Mass error = 1.0E-8, for the first 300 iterations), it takes a lot to get a Mass error < 1.0E-12. (Fortran 90 - Double Precision for any single real variable). So I wonder if there is any kind of speed up factor that could be used with the Rhie - Chow interpolation, for this purpose ? Thanks in advance, Goicox (goicox@hotmail.com) |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Collocated grid (Rhie and Chow) | C.Robin | Main CFD Forum | 5 | February 29, 2008 04:19 |
Rhie and Chow | James Houghton | Main CFD Forum | 0 | October 9, 2005 08:02 |
Rhie & Chow method/flame propagation? | yang | Main CFD Forum | 0 | May 19, 2005 09:00 |
Rhie - Chow speed up factors | Goicox | Main CFD Forum | 0 | November 22, 2003 01:00 |
Rhie & Chow interpolation | Barry | Main CFD Forum | 3 | January 20, 2003 10:11 |