[ANSYS Meshing] Changes in mesh type

blazejpop · August 20, 2013, 06:26

Hello guys.

I wonder if changes in mesh type produce some numerical inaccuracy? For example this mesh (hope that the author will not have it against me

):

Isn't it a "bad practice" to mix different kind of mesh types? On the other hand I heard about "Chimera grid".
What possible difficulties, problems, errors could produce such a methodology?

Far · August 20, 2013, 07:29

who is the author of this mesh

Having the mixed mesh is the next ambitios project at ANSYS. In this way you have more control on mesh that you are using high quality mesh (hexa) in critical region and tetra in less important regions. In this way you save large no of nodes in farfield.

blazejpop · August 20, 2013, 08:41

But does such transition affect or not on the results?

You wrote that it's for using "high quality mesh (hexa) in critical region and tetra in less important regions" i'm planning to do exactly the opposite. I want to do some propeller flow analysis, but I don't know how to do structured mesh around it, so I'm thinking of creating small domain around my propeller and mesh it with unstructured mesh, and bigger domain, in which there is any complex geometry with structured mesh.

Therefore I'm wondering if it would affect the results in such way that they will be unacceptable.

August 20, 2013, 06:26	Changes in mesh type	#1
blazejpop Member Błażej Popławski Join Date: Jul 2013 Posts: 34 Rep Power: 12	Hello guys. I wonder if changes in mesh type produce some numerical inaccuracy? For example this mesh (hope that the author will not have it against me ): Isn't it a "bad practice" to mix different kind of mesh types? On the other hand I heard about "Chimera grid". What possible difficulties, problems, errors could produce such a methodology?

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August 20, 2013, 07:29		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	who is the author of this mesh Having the mixed mesh is the next ambitios project at ANSYS. In this way you have more control on mesh that you are using high quality mesh (hexa) in critical region and tetra in less important regions. In this way you save large no of nodes in farfield.

August 20, 2013, 08:41		#3
blazejpop Member Błażej Popławski Join Date: Jul 2013 Posts: 34 Rep Power: 12	But does such transition affect or not on the results? You wrote that it's for using "high quality mesh (hexa) in critical region and tetra in less important regions" i'm planning to do exactly the opposite. I want to do some propeller flow analysis, but I don't know how to do structured mesh around it, so I'm thinking of creating small domain around my propeller and mesh it with unstructured mesh, and bigger domain, in which there is any complex geometry with structured mesh. Therefore I'm wondering if it would affect the results in such way that they will be unacceptable.