[ANSYS Meshing] Inflation in two bodies doesnt look like a single body

oozcan · December 20, 2016, 00:06

Hi all,

I would like find out why inflation in two bodies doesnt look like a single body. At the attached two screenshots are seen. I have done one part including two bodies.

Hint: Second one has the problem

Any knowledge, or thought?

Kind Regards,

Kapi · December 20, 2016, 00:12

i could find the problem in second pic.
What issue do you have? sorry i couldnt figure it out

Antanas · December 20, 2016, 00:18

Quote:

Originally Posted by oozcan

Hi all,

I would like find out why inflation in two bodies doesnt look like a single body. At the attached two screenshots are seen. I have done one part including two bodies.

Hint: Second one has the problem

Any knowledge, or thought?

Kind Regards,

Multibody Inflation

oozcan · December 20, 2016, 01:33

I am using 14.5 version I couldnt see multibody inflation. But I have done by selecting two bodies in geometry and wetted faces of interest in inflation tab.

oozcan · December 20, 2016, 01:41

Quote:

Originally Posted by Kapi

i could find the problem in second pic.
What issue do you have? sorry i couldnt figure it out

Well, thank you, as you can see there is no layer compression because of the place two bodies contact

Antanas · December 20, 2016, 02:03

Quote:

Originally Posted by oozcan

I am using 14.5 version I couldnt see multibody inflation. But I have done by selecting two bodies in geometry and wetted faces of interest in inflation tab.

What? I gave you link on flash video where it is shown how to get consistent inflation on multiple bodies. Have you watched it?

oozcan · December 20, 2016, 02:15

Quote:

Originally Posted by Antanas

What? I gave you link on flash video where it is shown how to get consistent inflation on multiple bodies. Have you watched it?

Thank you Antanas,

I couldnt realize that it was a link

Kind Regards,

oozcan · December 21, 2016, 03:21

Quote:

Originally Posted by Antanas

What? I gave you link on flash video where it is shown how to get consistent inflation on multiple bodies. Have you watched it?

I have watched the video. It is very different from thing I would like to make .

Please check watchfully regarding two screenshots. One of them has a layer compression in nozzle but the other one has an abrupt because of having two bodies. Inflation layer should follow like a single body. So, I need to split single body in order to see what some interior face values have in FLUENT. Inflation mesh couldnt like before.

I hope you understand what problem is

Kind Regards,

Antanas · December 21, 2016, 03:50

Quote:

Originally Posted by oozcan

I have watched the video. It is very different from thing I would like to make .

Please check watchfully regarding two screenshots. One of them has a layer compression in nozzle but the other one has an abrupt because of having two bodies. Inflation layer should follow like a single body. So, I need to split single body in order to see what some interior face values have in FLUENT. Inflation mesh couldnt like before.

I hope you understand what problem is

Kind Regards,

Just do mesh like on image. You can't make inflation layers to flow between bodies with this angles.

oozcan · December 21, 2016, 04:03

Quote:

Originally Posted by Antanas

Just do mesh like on image. You can't make inflation layers to flow between bodies with this angles.

I really dont understand, inflations should be given in boundary layer regions. It shouldnt be given joint of two bodies.That is my thought. Velocity in fluid flow must not be 0 there or decreased by shear stress . That is what, layer compression screenshot is correct, one way or another.

oozcan · December 21, 2016, 04:04

Quote:

Originally Posted by oozcan

I really dont understand, inflations should be given in boundary layer regions. It shouldnt be given joint of two bodies.That is my thought. Velocity in fluid flow must not be 0 there. That is what, layer compression screenshot is correct, one way or another.

the attahced one.

Stanley90 · December 21, 2016, 04:42

Hi. If I understand, you don't want 2 boundary layers in area you have indicated? Because I don't know whole geometry..

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oozcan · December 21, 2016, 04:46

Quote:

Originally Posted by Stanley90

Hi. If I understand, you don't want 2 boundary layers in area you have indicated? Because I don't know whole geometry..

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yes, there is no a single body, I have splitted to two that's why, two successive boundary layer occurs.

Stanley90 · December 21, 2016, 04:58

Some time ago, I have the same problem with my model of combustor (1 body) and let's say measurement domain (2 body). I had to create transition boundary layers for one duct. I did it in ANSYS Meshing module in Workbench using selective meshing if I remember correctly. Are you also using Workbench for this study?

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oozcan · December 21, 2016, 05:01

yes, I am using ANSYS-Meshing,as well.

Antanas · December 21, 2016, 05:09

Quote:

Originally Posted by oozcan

I really dont understand, inflations should be given in boundary layer regions. It shouldnt be given joint of two bodies.That is my thought. Velocity in fluid flow must not be 0 there or decreased by shear stress . That is what, layer compression screenshot is correct, one way or another.

Are there prism layers near walls? Yes, there are. So what's the problem?

Stanley90 · December 21, 2016, 05:10

Ok, so selective meshing should help you. Firstly insert inflation option on one body which is primary and then insert inflation at second body. You have to do it separately. After that, do the same with creating meshing: First click right bottom on primary body and select meshing on selected body... and when mesh is created do the same on second body. Consequently, second mesh should be depend on first mesh.

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Stanley90 · December 21, 2016, 05:24

ozcaan, here is more explanation about it: https://www.sharcnet.ca/Software/Ans...b_meshing.html

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Antanas · December 21, 2016, 05:32

Quote:

Originally Posted by Stanley90

Ok, so selective meshing should help you. Firstly insert inflation option on one body which is primary and then insert inflation at second body. You have to do it separately. After that, do the same with creating meshing: First click right bottom on primary body and select meshing on selected body... and when mesh is created do the same on second body. Consequently, second mesh should be depend on first mesh.

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This won't help him.

Stanley90 · December 21, 2016, 05:35

Quote:

Originally Posted by Antanas

This won't help him.

Why do you think so?

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December 21, 2016, 05:10		#17
Stanley90 Member Join Date: Sep 2014 Posts: 30 Rep Power: 11	Ok, so selective meshing should help you. Firstly insert inflation option on one body which is primary and then insert inflation at second body. You have to do it separately. After that, do the same with creating meshing: First click right bottom on primary body and select meshing on selected body... and when mesh is created do the same on second body. Consequently, second mesh should be depend on first mesh. Sent from my GT-I9505 using CFD Online Forum mobile app AntonY2J likes this.

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December 20, 2016, 00:12		#2
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 14	i could find the problem in second pic. What issue do you have? sorry i couldnt figure it out

December 20, 2016, 01:33		#4
oozcan Senior Member Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 461 Rep Power: 12	I am using 14.5 version I couldnt see multibody inflation. But I have done by selecting two bodies in geometry and wetted faces of interest in inflation tab.

December 21, 2016, 04:42		#12
Stanley90 Member Join Date: Sep 2014 Posts: 30 Rep Power: 11	Hi. If I understand, you don't want 2 boundary layers in area you have indicated? Because I don't know whole geometry.. Sent from my GT-I9505 using CFD Online Forum mobile app

December 21, 2016, 04:58		#14
Stanley90 Member Join Date: Sep 2014 Posts: 30 Rep Power: 11	Some time ago, I have the same problem with my model of combustor (1 body) and let's say measurement domain (2 body). I had to create transition boundary layers for one duct. I did it in ANSYS Meshing module in Workbench using selective meshing if I remember correctly. Are you also using Workbench for this study? Sent from my GT-I9505 using CFD Online Forum mobile app

December 21, 2016, 05:01		#15
oozcan Senior Member Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 461 Rep Power: 12	yes, I am using ANSYS-Meshing,as well.

December 21, 2016, 05:24		#18
Stanley90 Member Join Date: Sep 2014 Posts: 30 Rep Power: 11	ozcaan, here is more explanation about it: https://www.sharcnet.ca/Software/Ans...b_meshing.html Sent from my GT-I9505 using CFD Online Forum mobile app