|
[Sponsors] |
April 20, 2015, 21:21 |
Geometry & mesh - pipe
|
#1 |
New Member
Join Date: Apr 2015
Posts: 3
Rep Power: 11 |
Hello everybody!
I've got a problem - I'm trying to do an analysis of heating pipe. I need to create a mesh and boundary layer which will look how this one: I recently started working with Ansys and I don't know how to create a mesh like this... What should I do step by step? I've already created a geometry and extruded it: Now I need to create a mesh. I've tried to do it by sweep method: but it didn't work as you see... I guess that I should create a point in centre of circle and maybe do mapped face meshing? How to do step by step this regular mesh? Thanks in advance for any help you can give me |
|
April 21, 2015, 02:37 |
|
#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
Is there any specific reason why you want such a mesh? You will get bad quality elements in the center of the channel while refining the mesh.
I cant help you with this one, but here is an alternative. |
|
April 21, 2015, 08:21 |
|
#3 |
New Member
Join Date: Apr 2015
Posts: 3
Rep Power: 11 |
I've tried to do this like You recommed. I got something like this:
I'm doing analysis for my thesis. My thesis supervisor gave me instruction that it should be as I mentioned... |
|
April 21, 2015, 10:38 |
|
#4 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
I mentioned that the outcome of the tutorial would not be the kind of mesh you wanted, but an alternative with better mesh quality.
Tell your supervisor that the type of mesh he suggests will produce cells with bad quality in the center of the pipe (low angle to be more precise). Fluent WILL have trouble dealing with such cells, resulting in poor convergence or even divergence. Honestly, I cant think of a reason to use the mesh type your supervisor suggested other than showing that Fluent cant handle it very well. |
|
April 21, 2015, 10:51 |
|
#5 |
Senior Member
Rick
Join Date: Oct 2010
Posts: 1,016
Rep Power: 26 |
Best mesh is what flotus recommended and what you drew in your last message.
I don't know how to use ansys meshing but you can add a boundary layer on wall to improve the mesh. Moreover, in your first picture, the transition in size from the boundary layer to the center is too big in my opinon: transition in size should be 20-30% of adjacent cell.
__________________
Google is your friend and the same for the search button! |
|
April 21, 2015, 15:22 |
|
#6 |
Senior Member
Rick
Join Date: Oct 2010
Posts: 1,016
Rep Power: 26 |
If you want for some reasons draw the mesh of the first post you can search if there is the equivalent of gambit of the " Quad/Tri:Wedge Primitive meshing scheme".
Or that mesh can be drawn easely in gambit by splitting the circle into another smaller circle at the center and meshing it by tri elements and use quad mesh for the outer portion.
__________________
Google is your friend and the same for the search button! |
|
April 21, 2015, 17:45 |
|
#7 |
New Member
Join Date: Apr 2015
Posts: 3
Rep Power: 11 |
I understand what You mean about problem with mesh in centre of circle
(sth like this pink pipe here: http://www.cfd-online.com/Forums/ans...wing-pipe.html) I was thinking about sth like this one: http://www.cfd-online.com/Forums/ans...amic-mesh.html Ok. More or less, I know what kind of analysis I should do. Analysis of vertical pipe below; Dimensions: height: 20 [m] diameter: 50 mm How type of mesh You recommend for this? Multi zone + inflation? Last edited by Coatilque; April 22, 2015 at 18:41. |
|
April 22, 2015, 07:59 |
|
#8 |
New Member
zhouxman
Join Date: Dec 2014
Posts: 12
Rep Power: 11 |
May be the Gambit is a good option
you can divide the section |
|
November 30, 2020, 06:30 |
|
#9 |
New Member
physics baali
Join Date: Nov 2020
Posts: 10
Rep Power: 5 |
hello i want to do like your mesh but i don't know how
would you show me step by step how you did it please thank you |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[snappyHexMesh] No layers in a small gap | bobburnquist | OpenFOAM Meshing & Mesh Conversion | 6 | August 26, 2015 09:38 |
Moving mesh | Niklas Wikstrom (Wikstrom) | OpenFOAM Running, Solving & CFD | 122 | June 15, 2014 06:20 |
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation | tommymoose | ANSYS Meshing & Geometry | 48 | April 15, 2013 04:24 |
[Gmsh] 2D Mesh Generation Tutorial for GMSH | aeroslacker | OpenFOAM Meshing & Mesh Conversion | 12 | January 19, 2012 03:52 |
unstructured vs. structured grids | Frank Muldoon | Main CFD Forum | 1 | January 5, 1999 10:09 |