Structured Mesh Generation

nausheensultana · July 23, 2014, 15:14

Dear all,

I am Nausheen Sultana and I am new to this community as well as to CFD.

I am currently working on simulation of flow over a cylinder in 2D and for this I need a structured mesh. I have been struggling since past few days to create it but unfortunately the result at the end never converges. I actually want to create a structured mesh for 3D geometry and I have no clue how to proceed forward.
I have been searching online for it but I failed to find for a cylindrical geometry.
Can anyone please help me with it

colinda1 · July 28, 2014, 02:55

Dear Nausheen Sultana,
Which is the Reynolds number you are trying to simulate at?
In case it is around 100, the difficulty to converge may be related to the fact that laminar flow around a 2D cylinder at certain Reynolds numbers may be unsteady. It may be easier first to start with an Euler or fully turbulence simulation.

Shamoon Jamshed · August 20, 2014, 11:42

Dear Nousheen,

The best strategy to make the mesh around cylinder (stuructred obviously) is to split the edge of the cylinder into for parts, each at 90 degree. Then make a big square outside with centre at the centre of the circle. Split its edges from mid. Join each mid to the splitted circular edge in front of it. you will have for quadrants. If you use Gambit then total number of interval count on quarter circle edge will be the sum of interval count of the corner made by the opposite edges of square. Then make face of it and then mesh the face. In this way mesh the other three quadrants.

Shamoon Jamshed · August 20, 2014, 11:42

For making it 3D just extrude it in the third dimension

July 23, 2014, 15:14	Structured Mesh Generation	#1
nausheensultana New Member Nausheen Sultana Join Date: Jul 2014 Posts: 4 Rep Power: 11	Dear all, I am Nausheen Sultana and I am new to this community as well as to CFD. I am currently working on simulation of flow over a cylinder in 2D and for this I need a structured mesh. I have been struggling since past few days to create it but unfortunately the result at the end never converges. I actually want to create a structured mesh for 3D geometry and I have no clue how to proceed forward. I have been searching online for it but I failed to find for a cylindrical geometry. Can anyone please help me with it

July 28, 2014, 02:55		#2
colinda1 Senior Member Colinda Join Date: May 2012 Location: Brussels Posts: 151 Rep Power: 13	Dear Nausheen Sultana, Which is the Reynolds number you are trying to simulate at? In case it is around 100, the difficulty to converge may be related to the fact that laminar flow around a 2D cylinder at certain Reynolds numbers may be unsteady. It may be easier first to start with an Euler or fully turbulence simulation. Last edited by pete; July 28, 2014 at 04:01. Reason: removed link with advertising

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August 20, 2014, 11:42		#3
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 377 Rep Power: 18	Dear Nousheen, The best strategy to make the mesh around cylinder (stuructred obviously) is to split the edge of the cylinder into for parts, each at 90 degree. Then make a big square outside with centre at the centre of the circle. Split its edges from mid. Join each mid to the splitted circular edge in front of it. you will have for quadrants. If you use Gambit then total number of interval count on quarter circle edge will be the sum of interval count of the corner made by the opposite edges of square. Then make face of it and then mesh the face. In this way mesh the other three quadrants.