|
[Sponsors] |
September 26, 2003, 09:27 |
grid spacing!
|
#1 |
Guest
Posts: n/a
|
Hi my question about grid spacing is still unanswered. Is there anyone who can give some tips over this topic?
Regards Bhushan Yadav |
|
September 26, 2003, 10:09 |
Re: grid spacing!
|
#2 |
Guest
Posts: n/a
|
what is the question ?
|
|
September 28, 2003, 08:29 |
Re: grid spacing!
|
#3 |
Guest
Posts: n/a
|
Hi Pratap Thanks My question is for laminar viscous flow over a flat plate or for that matter on any other 2D configuration what is the criteria to choose first grid spacing, stretching function etc.? Does it differ for subsonic flow and hypersonic flow?
Regards Bhushan |
|
October 1, 2003, 02:49 |
Remarks on grid spacing
|
#4 |
Guest
Posts: n/a
|
hello, the grid size strongly depends on your problem and which region you are interest.
For the flat wall, the minimum height of grid size is about 0.2/sqrt(Re) to get a good solution at the distance of x=1 from the leading tip of the flat plat. For the flat wall, a high aspect ratio is helpful to stablize the solution, but not essential. For more general problems, you may put 5 grid layers within the boundary layer. Sun |
|
October 3, 2003, 10:51 |
Re: Remarks on grid spacing
|
#5 |
Guest
Posts: n/a
|
Hello Sun:
I am just curious how you determine 0.2/sqrtRe at x=1? I am not disagreeing ust curious? cheers, derrek |
|
October 4, 2003, 08:09 |
Re: Remarks on grid spacing
|
#6 |
Guest
Posts: n/a
|
The thickness of the boundary layer over a flat wall is about 1/sqrt(Re). If you add 5 grid layers there, then the grid size is 0.2/sqrt(Re). Centainly, you may choose finer grid size.
Once I did numerical tests for the problem a few years ago. I noticed that the grid size should be about the value or finer to be able to get a good friction force. The finer grid size improve the accuracy very little. Hope this answers your question. cheers Sun |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
conjugateHeatFoam, grid spacing and gradient calculation | benk | OpenFOAM | 1 | May 5, 2010 16:06 |
Grid Spacing Calculation | Zweeper | ANSYS Meshing & Geometry | 0 | February 7, 2010 09:47 |
grid pint and point spacing | sting7_sa | Main CFD Forum | 0 | October 11, 2009 23:08 |
Using grid spacing calculator for laminar flow | CH | Main CFD Forum | 0 | November 5, 2006 00:02 |
Combustion Convergence problems | Art Stretton | Phoenics | 5 | April 2, 2002 05:59 |