# Diagonal storage for c-grid airfoil possible?

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

 May 10, 2006, 10:13 Diagonal storage for c-grid airfoil possible? #1 zonexo Guest   Posts: n/a hi, 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. tks!

 May 10, 2006, 13:43 Re: Diagonal storage for c-grid airfoil possible? #2 Bounecer Guest   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

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post morteza08 Main CFD Forum 6 February 28, 2012 14:13 sunish5 ANSYS 1 October 26, 2010 23:29 nileshjrane OpenFOAM Running, Solving & CFD 8 August 26, 2010 12:50 nuimlabib FLUENT 2 June 29, 2009 08:11 albcem OpenFOAM 0 May 5, 2009 14:17

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