# Nose singularity of blunt body grids

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

 March 16, 2001, 04:11 Nose singularity of blunt body grids #1 Stefan Maehlmann Guest   Posts: n/a Sponsored Links Hello, when generating grids for symmetric blunt bodies (one block) a singularity is imposed at the nosetip. My question is if there is a way to get rid off this singularity or simplify somehow the treatment of this single point in the code. Thanks for your help.

 March 16, 2001, 08:01 Re: Nose singularity of blunt body grids #2 Brian Gribben Guest   Posts: n/a Ah, this can be a bit of a problem. Here's how I've seen it done before. Just use your normal grid format ( I assume you're using 3-D structured grids ). For the grid cells at the singularity, they will have one side collapsed to a line, in effect a five-sided rather than a six-sided cell. The trick is to still treat it as a normal six-sided cell, don't bother treating it as a special case. Just make sure that when you are calculating the area of this (collapsed) face you get a zero value, then ensure that this results in a zero flux contribution across that face. This may be a bit tricky if you have a viscous scheme but if you stick to the principle you should be ok : don't invent special treatments, just make sure your normal treatment does the right thing when it finds a zero cell area. It's hard to be more specific since different codes work out fluxes in different ways. I hope that helps.

 March 19, 2001, 11:18 Re: Nose singularity of blunt body grids #3 Erich Kreiselmaier Guest   Posts: n/a

 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 andres17 Main CFD Forum 19 April 26, 2016 15:29 msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58 liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07 CFDtoy Main CFD Forum 0 July 14, 2004 20:40 Stefan Main CFD Forum 8 August 4, 2001 22:33