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[ANSYS Meshing] Pipe bend meshing using MultiZone

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Old   February 7, 2014, 12:56
Default Pipe bend meshing using MultiZone
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There were some requests on how to produce a quality mesh for a pipe bend using Ansys mesher.
Since the basic procedure can be transferred to similar geometries, I decided to write a beginners tutorial for this purpose.

Geometry

Nothing special here. Create the geometry the way you want.
No need to do splits or face imprints.
When You are done, switch to the the Ansys mesher.
geometry.jpg


Meshing

Step 1
First thing we should always do when creating meshes for CFD simulations is switching the Physics Preference to CFD. This is not mandatory here, but the mesh will generally be much better suited for CFD.
I also switched the relevance center to medium, just to get slightly smaller elements with the default settings.
mesh_1.jpg

Step 2
Insert a new mesh control method.
mesh_2.jpg

Step 3
Select the whole volume as geometry for this method.
mesh_3.jpg

Step 4
Select MultiZone from the method drop down menu.
mesh_4.jpg


...continued in the next post
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Old   February 7, 2014, 12:57
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Step 5
Insert an "inflation" mesh control.
mesh_5.jpg

Step 6
Again, select the whole fluid body as geometry.
mesh_6.jpg

Step 7
Select the outside faces as boundaries for the inflation.
mesh_7.jpg

Step 8
Choose values appropriate for your geometry and application.
The values I put here are just an example to make the result look good.
You can generate the mesh now, the result will be quite good
mesh_8.jpguniform.jpg

...continued in the next post
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Old   February 7, 2014, 12:57
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Step 9
For an even better result, edit the details of the multizone method.
Change the Source/Target selection to manual source and select one of the circular faces of the pipe as geometry.
Thats it. You can now generate the mesh and contemplate the result.
mesh_9.jpg

Result
mesh_final.jpg
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Old   November 3, 2014, 16:08
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Quote:
Originally Posted by flotus1 View Post
Step 9
For an even better result, edit the details of the multizone method.
Change the Source/Target selection to manual source and select one of the circular faces of the pipe as geometry.
Thats it. You can now generate the mesh and contemplate the result.
Attachment 28559

Result
Attachment 28560
Many thanks for useful guide
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Old   November 4, 2014, 03:42
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the last step does not seem to work for me, gives the same result which is like the picture you have given before your last step of change to manual and selecting a face...
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Old   November 4, 2014, 04:18
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Originally Posted by hwet View Post
the last step does not seem to work for me, gives the same result which is like the picture you have given before your last step of change to manual and selecting a face...
I followed the steps, but it worked, do you select your first sketch which you sweep it to make model as a source?
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Old   November 4, 2014, 04:50
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my geometry is made in solidworks but i dont think it should make a difference
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Old   June 2, 2015, 13:26
Default inflation number of radial elements and in direction of flow
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Quote:
Originally Posted by flotus1 View Post
Step 9
For an even better result, edit the details of the multizone method.
Change the Source/Target selection to manual source and select one of the circular faces of the pipe as geometry.
Thats it. You can now generate the mesh and contemplate the result.
Attachment 28559

Result
Attachment 28560
hi flotus1,

I created an O-grid like that but for a straight duct. Now I have 2 questions and would appreciate if you could answer them
1.) The elements close to the square in the middle of the mesh are pretty
big. How can I set their sizes (like the ratio of the last cell before the
scare and the first cell at the wall should equal 2)
=> Right now my settings are: TransitionRatio=0.8, Number of
Layers=20 and GrowthRate=1.2
2.) I also want to create an Inflation in flow direction of the pipe, but
everytime I try that the inflation for the O-Grid dissapears :/

I hope you can help me
Thanks, greetings from South Germany
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