|
[Sponsors] |
May 30, 2001, 22:37 |
How aspect ratio affects k-e isotropy?
|
#1 |
Guest
Posts: n/a
|
Hi there,
I currently simulating the dilution pattern of wastewater discharged into the ocean with currents from a multiport diffuser (number of pipes). The situation is as follows: [1] Carried simple run with coarse grids and found dilution overpredicted due to numerical diffusion by approx. 30% [2] Increased grid density by 2 times, and found dilution results an exact match with experiment. [3] Further increased grid density by another 100 thousand and once again dilution was overpredicted by approx. 10-50%. Qn 1. results should improved with increasing grids points, so why is the above happening? Qn 2. The max aspect ratio of my grids are 200 for [2] and 40 for [3]. Shouldn't an improved results be obtained for a standard cube as compared to a cuboid? Qn 3. K-e isotropy and aspect ratio of grid has anything to do with the results i'm getting?? Anybody has any idea what is happening? I'm really stumped! Please help...Any suggestions are welcome. Thank You. Regards, JJ |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
pressure eq. "converges" after few time steps | maddalena | OpenFOAM Running, Solving & CFD | 69 | July 21, 2011 07:42 |
[ICEM] Mesh along axis for a wedge gives elements with extreme aspect ratio | sangrampp | ANSYS Meshing & Geometry | 0 | November 17, 2010 06:57 |
aspect ratio vs. y+ | hammam | CFX | 3 | August 6, 2007 10:41 |
High Aspect Ratio elements | Flavio | CFX | 2 | November 24, 2006 12:01 |
Aspect Ratio at high turbulent and swirled flows | zago | FLUENT | 0 | May 19, 2004 02:37 |