[ICEM] Interface Problem / Resolution of ICEM

Bembei · October 22, 2015, 12:40

Hello,

i got a problem with the interface between the distributor and the runner of a Francis-Turbine. "Fluent" says that the interface overlap but the diameter of distributor-outlet and runner-inlet are the same. This looks like an resolution problem in ICEM. Here some pictures.

problem.jpg problem_surface.jpg assembly.PNG resolution_1.JPG resolution_2.JPG

Why is there this burr on the edge and why is the mesh-surface piecewise linear.
Is there any chance to solve this problem, to improve the circularity? By the way this is for my bachelor's thesis and the geometrie and blockings are given.

I appreciate your help,
Best,
Michael

Far · October 23, 2015, 11:03

which type of interface you are using. Keep in mind you need to select different settings for axial and radial machines... !!!

Bembei · October 26, 2015, 05:45

Thanks for the response Far,

I have chosen these settings for the interface:

Interface_setup.JPG

The preview mesh motion works and gives the following resultes:

mesh-0010.jpg mesh-0011.jpg mesh-0012.jpg

I'm using the "Mesh Motion" methode.
Is this the right setup for the interface?

Thank you in advance

Far · October 26, 2015, 06:47

choose only periodic repeats as I am assuming you want to have stator-rotor interface. Un select any thing else.

Quote:

I'm using the "Mesh Motion" method

You mean to say "for sliding mesh" ?

Bembei · October 26, 2015, 11:07

yes i want to have stator-rotor interface:

Interface.JPG : Interface is yellow.

I have chosen the following setting for the interface

Interface_setup.JPG

I did not choose the periodic repeat because I don't have a periodic geometrie. I have made a calculetion and it worked, thanks! But Fluent reports "Info: Interface zones overlap for mesh interface interface-sc-runner. This could adversely affect your solution." It's only an info, can i gnore it?

Far · October 27, 2015, 04:07

Ok. Since you are modeling complete (360) geometry, therefore you dont need to select the periodic repeats.

I cannot recall exactly where this command is located, but there is different option to be selected to radial and axial machines in interface.

Bembei · November 3, 2015, 08:28

I found the solution. ICEM has a limited resolution of surfaces and curves thats made my interface non‐axisymmetric. The problem was fixed by creating an interface surface and curves over only 1 degrees, and copying those to the full
360 degrees giving a much better representation.

Thanks Far for your help.

October 22, 2015, 12:40	Interface Problem / Resolution of ICEM	#1
Bembei New Member Michael Stemplinger Join Date: Oct 2015 Posts: 4 Rep Power: 11	Hello, i got a problem with the interface between the distributor and the runner of a Francis-Turbine. "Fluent" says that the interface overlap but the diameter of distributor-outlet and runner-inlet are the same. This looks like an resolution problem in ICEM. Here some pictures. problem.jpg problem_surface.jpg assembly.PNG resolution_1.JPG resolution_2.JPG Why is there this burr on the edge and why is the mesh-surface piecewise linear. Is there any chance to solve this problem, to improve the circularity? By the way this is for my bachelor's thesis and the geometrie and blockings are given. I appreciate your help, Best, Michael Last edited by Bembei; October 22, 2015 at 12:50. Reason: new pictures

November 3, 2015, 08:28		#7
Bembei New Member Michael Stemplinger Join Date: Oct 2015 Posts: 4 Rep Power: 11	I found the solution. ICEM has a limited resolution of surfaces and curves thats made my interface non‐axisymmetric. The problem was fixed by creating an interface surface and curves over only 1 degrees, and copying those to the full 360 degrees giving a much better representation. Thanks Far for your help. Far and Maerluz like this.

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October 23, 2015, 11:03		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	which type of interface you are using. Keep in mind you need to select different settings for axial and radial machines... !!!

October 26, 2015, 05:45		#3
Bembei New Member Michael Stemplinger Join Date: Oct 2015 Posts: 4 Rep Power: 11	Thanks for the response Far, I have chosen these settings for the interface: Interface_setup.JPG The preview mesh motion works and gives the following resultes: mesh-0010.jpg mesh-0011.jpg mesh-0012.jpg I'm using the "Mesh Motion" methode. Is this the right setup for the interface? Thank you in advance

October 26, 2015, 11:07		#5
Bembei New Member Michael Stemplinger Join Date: Oct 2015 Posts: 4 Rep Power: 11	yes i want to have stator-rotor interface: Interface.JPG : Interface is yellow. I have chosen the following setting for the interface Interface_setup.JPG I did not choose the periodic repeat because I don't have a periodic geometrie. I have made a calculetion and it worked, thanks! But Fluent reports "Info: Interface zones overlap for mesh interface interface-sc-runner. This could adversely affect your solution." It's only an info, can i gnore it?

October 27, 2015, 04:07		#6
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Ok. Since you are modeling complete (360) geometry, therefore you dont need to select the periodic repeats. I cannot recall exactly where this command is located, but there is different option to be selected to radial and axial machines in interface.