# [ICEM] Merge Two Meshes

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February 8, 2018, 20:11
Merge Two Meshes
#1
New Member

joygiak
Join Date: Sep 2017
Location: Greece
Posts: 7
Rep Power: 6
Hello Guys,

I am working on a mesh for a propeller, inside of a rectangular duct . I have already make the structured mesh for the propeller as you can see in the first picture. Also for the duct I made a structured mesh, as you can see in the second picture. The common face is the green area. I am trying to merge these two domains in a proper way. The final result would be like something, third picture. I want the air flow to pass through the blue inlet circle and the red inlet area to be a wall! After this, I would solve the case in CFX! Can anyone suggest me a way to do it right ; Any advice would be useful , thanks in advance!
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February 9, 2018, 07:46
#2
Senior Member

MS
Join Date: Jan 2014
Location: England
Posts: 324
Blog Entries: 1
Rep Power: 10
Quote:
 Originally Posted by joygiak Hello Guys, I am working on a mesh for a propeller, inside of a rectangular duct . I have already make the structured mesh for the propeller as you can see in the first picture. Also for the duct I made a structured mesh, as you can see in the second picture. The common face is the green area. I am trying to merge these two domains in a proper way. The final result would be like something, third picture. I want the air flow to pass through the blue inlet circle and the red inlet area to be a wall! After this, I would solve the case in CFX! Can anyone suggest me a way to do it right ; Any advice would be useful , thanks in advance!

1)Save the first mesh (propeller) as a seperate project (eg. project1). Name it's outer boundary as eg. Interface_1 before you save it. (make sure you convert to unstructured mesh before saving it)

2) Save the second mesh(outer mesh) as a seperate project (eg. project2). Name it's inner boundary (the one that will merge with interface_1 with a new name (eg. Interafce_2). (make sure you convert to unstructured mesh before saving it)

3)Now create a new project (eg. project3). Open the geometry of project1 and then open the geometry of project2.

4)when you open the geometry of project 2 you will be given an option to replace or merge geometries. choose merge.

5)Now open the unstructured mesh for project 1 followed by the unstructured mesh for project 2 and choose merge as well.

And then bam, you have your desired mesh.

Thanks
MS

 November 7, 2018, 23:40 Problems with merging geometry #3 New Member   Fonas Juhrmeister Join Date: Nov 2018 Posts: 2 Rep Power: 0 Hey @sheerez234 I tried to do what you described here, but I have a problem in merging geometry. When I load the second geometry and click merge, the two geometries never merge on interface, but on another wall. Although I have defined all my geometry.. do you know any possible mistakes I made?

 November 8, 2018, 07:44 #4 Senior Member   Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,389 Rep Power: 21 Why do you want to merge these? In CFX, you can import both meshes separately and define a sliding interface between the rotating and the stationary part, not? Then both volumes will be treated as separated meshes, so there is no need to merge. Not even in a frozen rotor simulation...... lgn_aero and aero_head like this.

 November 8, 2018, 11:23 #5 New Member   Fonas Juhrmeister Join Date: Nov 2018 Posts: 2 Rep Power: 0 hey Gert-Jan thanks for your answer, but i am not the guy who originally post this thread. i try to mesh a transacted rotor with smallblades. so i have one geometry with mesh which is 10mm wide and another with different kind of blades, which is 90mm wide. i need to merge them on an interface surface, but they always merge on the outer wall of 10mm wide geometry, so i got an overlapping meah

 July 8, 2020, 03:31 #6 Member   Sai Krishna Join Date: May 2018 Posts: 33 Rep Power: 5 Hi Shereez, I have a doubt regarding this. If we open 2 geometries and perform merging, will the 2 interfaces created get merged or we need to merge them manually. I am working on a geometry consisting 2 cylinders with 2 different blocking setups. so meshed them separately and tried to merge the meshes as you suggested. But its not happening. The 2 surfaces remained as it is and my structured mesh changed to unstructured. I have attached screenshots for the reference and any help will be appreciated. Thanks Screenshot (235).jpg Screenshot (236).jpg

 Tags icem, merge meshes, propeller