# Meshing Structured Grid

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 July 25, 2017, 11:22 Meshing Structured Grid #1 Member   Abhinand Join Date: Jun 2016 Posts: 75 Rep Power: 9 Hello guys, I want to create a structured domain of a 20*20 square with a 0.1 inch circle inside it. How do I create the best mesh. Does it necessarily have to be structured in order to have better quality. Please help me how to proceed with the grid generation Many thanks

 July 25, 2017, 15:24 #2 Member     Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10 Hello! Divide the circle connector into 4 parts (begin from 45 degrees angle with step of 90 degrees) and draw 4 connectors from division points of the circle to the vertices of the square. Then put some points on the new connectors (the number depends on the type of the problem), adjust spacing. The result is structured mesh with 4 domains.

 July 26, 2017, 06:35 #3 Member   Abhinand Join Date: Jun 2016 Posts: 75 Rep Power: 9 Thanks for your reply. I meshed the circle with OH topology and I tried using this method before, It resulted in high maximum included angle at the connectors joining the circle and the vertices of square. I tried running the solver and the results didnt change much. That is the reason I posted here, if there was some other method or approach or maybe how to better my mesh quality. The problem with my geometry is the diameter of my circle is just 0.1 inch and the dimensions of square are 20 inches. Moreover the circle is not placed in the exact centre it is eccentric and is at a point (7,10) in the x-y plane Any more suggestions?

 July 27, 2017, 06:19 #4 Member     Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10 Does the circle stand for wall boundary condition? What about the sides of the square? Sent from my Redmi Note 3 using CFD Online Forum mobile app

 July 27, 2017, 06:49 #5 Member   Abhinand Join Date: Jun 2016 Posts: 75 Rep Power: 9 The circle is an injector and its interior i suppose the square is a flat plate and the domain of the square mesh is wall. Im going to create a structured mesh with the square and circle i defined and extrude it in the y direction to create a block. This is going to be a 3D simulation So I was looking for ideas to create a quality structured mesh Thanks

 July 27, 2017, 16:46 #6 Member     Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10 Try drawing connectors via Bezier curves - you may vary inclination of the line in the end points this way. Also take a look at the pictures. I think it's a good idea for a mesh type that you need. In the inner side of the circle you may use butterfly topology Abhinand likes this.