CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Diagonal storage for c-grid airfoil possible?

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   May 10, 2006, 10:13
Default Diagonal storage for c-grid airfoil possible?
Posts: n/a

i'm trying to solve the sys of linear eqns due to flow past a c-grid airfoil. due to the structure of c-grid, it is folded such that it touches itself, resulting in coordinate cut.

becuase of this, it is not possible to use the diagonal storage for the "A" matrix. Besides increase in memory, iteration is also slower when using other forms of matrix storage such as compressed sparse row.

is there any way (reorder, ghost cell etc) which can be done to enable the use of diagonal storage? any hints will be welcomed.

  Reply With Quote

Old   May 10, 2006, 13:43
Default Re: Diagonal storage for c-grid airfoil possible?
Posts: n/a
I've written a fortran code program to study 2D, incompressible viscous flow about airfoil, i've used structured C-grid generation and discretized the flow equations in numerical domain with finite volume method. I've introduced SIMPLER algorithm and used second order UPWIND scheem for convective terms. I've obtained a pentadiagonal system, with sweeping and TDMA (tridiagonal matrix algorithm) i've solved the system. My program run with verry small relaxation parameters (5*10**-2), but when the difference between two consecutive values of velocity is (10**-4) it diverges
  Reply With Quote


Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Airfoil Grid Generation morteza08 Main CFD Forum 6 February 28, 2012 14:13
Grid generation of an airfoil in Ansys workbench 12.1 sunish5 ANSYS 1 October 26, 2010 23:29
Error while running rhoPisoFoam.. nileshjrane OpenFOAM Running, Solving & CFD 8 August 26, 2010 12:50
how iam determine good quality of mesh grid of airfoil using gambit nuimlabib FLUENT 2 June 29, 2009 08:11
MapFields to New Grid For Extreme Grid Deformations due to Body Motion albcem OpenFOAM 0 May 5, 2009 14:17

All times are GMT -4. The time now is 06:32.