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Old   March 16, 2012, 15:26
Default Meshing complex geometry
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andres
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Hi everyone
I am struggling to mesh a complex geometry. I have tried almost everything without success,
I would appreciate if some of you could give me a hand on it
Attach you will find such a model

Any idea about how to approach this problem?
this is a domain of a fluid.

Thanks
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File Type: jpg Untitled2.jpg (33.9 KB, 144 views)
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Old   March 19, 2012, 09:49
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Quote:
Originally Posted by cfdhydraulic View Post
Hi everyone
I am struggling to mesh a complex geometry. I have tried almost everything without success,
I would appreciate if some of you could give me a hand on it
Attach you will find such a model

Any idea about how to approach this problem?
this is a domain of a fluid.

Thanks
Can you attach your geometry file please.
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Old   March 19, 2012, 09:59
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Thanks for you quick response.
This site doesn't allow to upload a 3MB file.
Could you please give me your email so i can send to you?
you can email me at andres.rperez@hotmail.com

Thanks again
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Old   March 19, 2012, 10:13
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Quote:
Originally Posted by cfdhydraulic View Post
Thanks for you quick response.
This site doesn't allow to upload a 3MB file.
Could you please give me your email so i can send to you?
you can email me at andres.rperez@hotmail.com

Thanks again
I have sent you an email. Please respond to that. Why are you using all quad mesh by the way?
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Old   March 19, 2012, 10:14
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I tried everything... not only quad mesh... just everything and nothing worked...
I will check my email
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Old   March 19, 2012, 10:17
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still waiting... no new emails yet
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Old   March 19, 2012, 10:28
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Could you please send an email again?
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Old   March 19, 2012, 10:29
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fine! I got it!
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Old   March 19, 2012, 23:37
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can you send geometry to sarang.dalne@gmail.com?
What type of analysis you want to perform on this model? This will drive what type of mesh to be used.
Did you try thin sweep with this model?
I guess you have to try mixing couple of methods to get the desired mesh quality here.
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Old   March 20, 2012, 04:31
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Quote:
Originally Posted by cfdhydraulic View Post
I tried everything... not only quad mesh... just everything and nothing worked...
I will check my email
Andres,

Have just checked the IGES file sent by you. One quick issue is that you did create the hydraulic model in a way that some additional solid bodies were also created. You need to suppress the solid bodies in solidworks or you can bring in the solid geometry in WorkBench and create hydraulic model by fill tool.

If you just want to continue with the iges file that you have sent to me then suppress all the bodies in DM except the first one. Then try refined mesh using curvature as advanced sizing Function and defining appropriate sizing criteria.
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Old   March 20, 2012, 19:59
Default convergence
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Thanks I will try to do that. But with IGES file no problems were found.
However I have a problem with convergence

I am studying a transient state study (unsteady).
The first iteration is correct and it achieves a perfect convergence but, the second one... it doesn't converge at all

that's the problem?? is there anything I would change?
I decreased the time step to 1E-05 but it didn't converge whatsoever

any idea??

thank you
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Old   March 21, 2012, 04:06
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This is because of the mesh, you need to refine it and before that delete the bodies except the first, otherwise the mesher creates two meshes on same part.
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Old   March 21, 2012, 09:24
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but actually I modified the model and I don't have 8 bodies anymore but just one.
I am going to refine the mesh anyway. However if I refine it I will get smaller cells which will decrease my time step right? I am working with a 0.00001 time step... if I use lower values it going to take forever to simulate 1 second simulation!

any suggestions?
thanks
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Old   April 27, 2017, 04:03
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Hi everyone

i am working on a CHT-simulation with fluent and got big Problems with the meshing. There are one Fluid-Domain und one Solid Domain, which generate heat.

I have tried to clean up the geometry as much as possible. Has anybody idea?

Best regards
Xl
1.png

1_1.png

1_2.png

1_3.png

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Old   April 27, 2017, 04:09
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Old   May 4, 2017, 10:09
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Hello, I am having some problems with meshing Francis turbine. I am using Fluent and I defined 4 bodies (Inlet(spiral casing), Stator, Rotor and Outlet). First, I tried the PCM(Automatic Method) and it was fine but when I tried to simulate the turbine an error occured, saying that "Divergence detected in amg solver epsilon"(I was using k-epsilon method). So I decided to refine a mesh but geometry is pretty complex so I dont know which meshing method to use. I think Sweep and Multizone are hard to get, what do you think? Any advice?

P.S. I tried to Merge faces/bodies but then my geometry changes a lot
PPS If its necessary I can post .step file

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