# Icem cfd Cartesian mesh method size proplem

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 May 18, 2009, 13:50 Icem cfd Cartesian mesh method size proplem #1 New Member   onder Join Date: Mar 2009 Posts: 18 Rep Power: 10 hi everyone first ı am sory for my english my problem I want do mesh with cartesian method. there are 8 surface and ı chose diffrent size for surfaces like 1m,3m,5m . when computed the mesh every surfaces size to be the smallest value 1m Icant use diffrent size. Anyone help me ? Thanks everything

 May 18, 2009, 20:02 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,808 Rep Power: 107 Hi, Have you done the ICEM tutorial examples. This sounds like a pretty basic problem to me, you need to learn the fundamentals. Glenn Horrocks

 May 20, 2009, 14:25 help #3 New Member   onder Join Date: Mar 2009 Posts: 18 Rep Power: 10 I have not much time . please some ona help me. how I do diffrent size for surface at cartesian mesh

 May 20, 2009, 18:45 #4 Member   Jules Bell Join Date: May 2009 Posts: 31 Rep Power: 10 Your problem is not specified very clearly but consider this: For a cartesian mesh (block structured mesh), blocks sharing one edge (adjacent surfaces) must have equal number of nodes in the direction (i,j, or k) of that edge, because grid lines cannot "end" in the middle of the mesh, they have to go all the way through from one side to the other. Probably for that reason, the mesher adjusts all the spacings to be the same, to ensure equal number of nodes. How are you creating your mesh? From blocking (Pre-Mesh) or from surface mesh?

May 24, 2009, 19:56
#5
Senior Member

Rogerio Jack
Join Date: Mar 2009
Location: Brazil
Posts: 100
Rep Power: 9
I´d like to use this type of mesh, using a cartesian method, but it didn´t work out with my geometry. What is your geometry?

Rogerio.

Quote:
 Originally Posted by mztcu hi everyone first ı am sory for my english my problem I want do mesh with cartesian method. there are 8 surface and ı chose diffrent size for surfaces like 1m,3m,5m . when computed the mesh every surfaces size to be the smallest value 1m Icant use diffrent size. Anyone help me ? Thanks everything

 May 25, 2009, 08:45 #6 New Member   onder Join Date: Mar 2009 Posts: 18 Rep Power: 10 ı want simulate free surface around the ship hull.geomtry ship hull and sea like pool

 May 26, 2009, 08:55 Pure Cartesian vs. Unstructured Cartesian #7 Retired from CFD Online     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,665 Blog Entries: 1 Rep Power: 39 Your problem probably has to do with uniform sizes, but once you fix that, you will still have issues because your sizes are not powers of 2… If you are generating a uniform mesh, then the smallest “max size” is applied to the entire model… This is probably your problem. Look at your settings carefully. I agree about trying a tutorial or two, they don’t take long each and would have got you going faster than waiting for a reply from us. The other issue is that the Cartesian and Octree methods can’t give you every size, only powers of 2. In this case, you can’t have sizes 1, 3 and 5 in the same model because these are not powers of 2. You could have sizes 1, 2, 4, or sizes 1.5, 3, 6 or sizes 1.25, 2.5, 5. Get it?

 May 26, 2009, 23:43 #8 New Member   onder Join Date: Mar 2009 Posts: 18 Rep Power: 10 thank you very much I will try

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