CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Viscous flow simulation

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 4, 2001, 05:53
Default Viscous flow simulation
  #1
K. I. Chan
Guest
 
Posts: n/a
Hello,

I am currently implementing a Navier-Stokes solution on 2D unstructured meshes in which the cells near wall boundaries and wakes are stretched. May I know if anyone knows about the implementation of 2nd/4th order smoothing on stretched triangular cells. Would appreciate suitable references on this matter.

Thanks very much, Chan K I
  Reply With Quote

Old   April 6, 2001, 01:28
Default Re: Viscous flow simulation
  #2
Abhijit Tilak
Guest
 
Posts: n/a
hi Chan,

well, can u be more specific! I mean are you using pressure based methods (SIMPLE ect) then i can help. I have implemented a pressure based method on unstructured grids (2-D traingles). Regarding the stretched cells i am afraid that to say that the accuracy of viscous terms is considerably affected by aspect ratio of the traingles.Consider hybrid grids (quads in B.L.)

Abhijit Tilak
  Reply With Quote

Old   April 6, 2001, 03:02
Default Re: Viscous flow simulation
  #3
K. I. Chan
Guest
 
Posts: n/a
Hi Abhijit,

I'm using a density based method for compressible flow simulation over a NACA 0012 airfoil.

Regards, Chan K I
  Reply With Quote

Old   April 6, 2001, 05:20
Default Re: Viscous flow simulation
  #4
Abhijit Tilak
Guest
 
Posts: n/a
hi chan,

it's not clear to me what smoothing are u refering to. bcos need for smoothing arises in case of Pressure based methods. I can give u some references 1. 'An Efficient & Stable Solution Procedure of Comp. Turbulent flow on General Unst. Meshes" by L.Davidson AIAA 95-0342. (u can download this at Prof Lars Davidsons site Univ of Chalmers, Dept of Thermo-Fluids, Sweden) search thru google. U may find many more papers here.

2. "A fully inplicit NS Algorithm for Unst Grids incorporating two eq turbulence model". by D.D Knight AIAA 96-0414. (U can download this at Prof Knight's website, Dept of Mech & Aero Rutgers NJ.

I hope these help. Abhijit Tilak
  Reply With Quote

Old   April 6, 2001, 12:41
Default Re: Viscous flow simulation
  #5
K. I. Chan
Guest
 
Posts: n/a
Hi Abhijit,

Thanks very much for the sources of references.

The smoothing is the addition of artificial viscosity of the type described in Antony Jameson's "Improvements to the Aircraft Euler Method."

Hope that rings a bell.

Best regards, Chan K I
  Reply With Quote

Old   April 7, 2001, 02:26
Default Re: Viscous flow simulation
  #6
Abhijit Tilak
Guest
 
Posts: n/a
hi chan,

well , i don't know anything of the method you are saying. so i can't be of much help. thanks & good luck abhijit
  Reply With Quote

Old   April 7, 2001, 02:56
Default Re: Viscous flow simulation
  #7
John C. Chien
Guest
 
Posts: n/a
(1). I think, Prof. Jameson has a webpage at Stanford University, Department of Aeronautics. (2). Why not send e-mail directly to him? So, you can get his answer directly.
  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Domain format problem on airfoil flow simulation andrenonaka CFX 14 December 7, 2015 01:42
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 16:45
calculate volume flow from a 2D simulation SimonH. OpenFOAM 0 October 27, 2009 05:39
Internal flow simulation boundary conditions Kishore FLUENT 1 July 10, 2007 12:42
Better for Simulation of Dense Solid-Lquid Flow ? Jeniffer CFX 0 November 22, 2003 20:42


All times are GMT -4. The time now is 21:50.