# Mesh distortion close to cylind wall-GAMBIT 2.2.30

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 April 13, 2006, 18:38 Mesh distortion close to cylind wall-GAMBIT 2.2.30 #1 Mirek Guest   Posts: n/a Hello everybody I have a problem with Gambit 2.2.30 when I try to perform extra fine mesh (1e-5) close to the wall of cylinder (circle 2-D case). I built geometry using square and circle placed in the center then I subtract the circle from square (it's a part of discrete area). I divided such a face into four pieces (faces).I tried to mesh this small face using submap (the opposite edges have the same number of mesh elements) in two ways but failed: 1. Create boundary layer and then perform mesh face but the mesh and the boundary layer don't meet each other i. e. the mesh is abnormally skewed close to the wall. There aren't straight radial lines but zigzaged irregular lines! 2. Create extra fine mesh close to the wall by the aid of first length scheme (=1e-5). In this manner I'm obtaining better result but very close to the wall radial lines are similar to waved lines and try of smoothing cause worse effect. I want to mention that I don't remember that I had such problems when I working on previous versions of Gambit. Boundary layers were working very well. Very strange situation take place when you try to perform boundary layer on whole not dividededge edge of circle - farther lines at vertex are very distorted. It appeares something like long triangle with top diverted in normal direction to the wall (when you create about 15-20 rows). Why? I don't understand. Some details: a) square side = 22mm b) circle diameter = 12mm c) mesh spacing on circle edge = 0.2mm d) number of mesh elements on square edge results from (c) e) max growth factor b/a=1.2 f) quadrilateral mesh elements Could enyone meet such a strange problem? Thanks in advance for any kind of help.

 April 15, 2006, 17:22 Re: Mesh distortion close to cylind wall-GAMBIT 2. #2 Mirek Guest   Posts: n/a I helped myself simply changing defaults settings - Edit\Edit defaults\Mesh face ...

 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 swahono OpenFOAM Running, Solving & CFD 9 May 22, 2017 16:27 DarrenC FLUENT 7 November 15, 2016 11:01 Yr0gErG FLUENT 3 June 12, 2013 02:12 sc298 OpenFOAM Native Meshers: snappyHexMesh and Others 2 March 27, 2011 21:11 SSL FLUENT 2 January 26, 2008 12:55

All times are GMT -4. The time now is 20:59.

 Contact Us - CFD Online - Privacy Statement - Top