# [ICEM] Domain shape for meshing missile - ICEM HEXA

 Register Blogs Members List Search Today's Posts Mark Forums Read

 July 28, 2013, 14:32 Domain shape for meshing missile - ICEM HEXA #1 Senior Member   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54 I am meshing a missile configuration with card and fins. Total four canards and four fins and both are offset by 45 to each other. Used X-y and X-Z symmetry to reduced model to 1/4 of original. Done all associations, Ogrid around canard, fins and fuselage. I am just wondering should I use rectangle domain or circular cylinder domain?

 July 29, 2013, 00:15 #2 Super Moderator     Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29 go with a circular domain like the shape of the missile Far and PSYMN like this. __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

 July 29, 2013, 08:57 #3 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47 I have seen it done both ways with good success, but if I had to pick one as "better", I would also go with the cylinder because it uses the elements most efficiently and with the least unnecessary distortion. Far and cesarcg like this. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

 July 29, 2013, 10:03 #4 Senior Member   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54 After apply two symmetrie, canard (four in no.) are divided into half. so i have one (half) canard in Y direction and one (half) in Z direction. Now dealing with this situation is easy and efficient in rectangle domain. Next component is fin (four in no) which are offset by 45 deg from canards. Therefore I have one full fin at 45 deg from Z and Y. This is where I get problem in rectangular domain. Can I use rectangle domain efficiently for this situation?

 July 31, 2013, 09:22 #5 Member   Cesar Join Date: Nov 2012 Location: Guanajuato, México Posts: 78 Rep Power: 15 Hi Far, I have no experience in this but you should give it a try with a rotated rectangular domain and find that out. Regards.

 July 31, 2013, 14:34 #6 Senior Member   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54 I tried with circular domain and it is great. Following are the images of ICEM CFD blocking/mesh from drag prediction workshop 2. Domain shape is rectangular and it is the best choice for such configurations. But for the cases with some components offset by 45 deg, I guess circular domain is the best. I am particularly interested in the blocking in the tip region of wing. Why they have used nested O-grid in only small portion of tip block in tip region and why o-grid was not extended to far field? For what shapes we should use closed o-grids and when we should go for the extended o-grid to farfield? ahmadreza likes this.