number of nodes in solid domain

Studentdrak · May 2, 2012, 05:24

Hi,

I want to know what decides the number and distribution of nodes in a solid domain in a CHT problem.(Like we have y+ for a fluid domain).

Thanks

ghorrocks · May 2, 2012, 19:17

It is determined by your mesh, obviously.

But I think you are asking what should you consider as you mesh a solid body for CHT simulation.

In a solid the only thing you are resolving is the temperature gradient. In steady state simulations this is usually much more gentle than any flow gradient, meaning a much coarse mesh is acceptable. In transient simulations you need to resolve the temperature gradient in time and space - if you are trying to resolve a very fast temperature transient then you will need a fine mesh to resolve it.

In the unusual case of a transient simulation with a fast temperature gradient inflation layers may be appropriate. Otherwise, a coarser mesh is usually fine as it simply has to resolve the temperature gradients.

But as ever, check it with a mesh sensitivity study to check that it is OK.

Studentdrak · May 2, 2012, 22:18

Thanks Glenn

May 2, 2012, 05:24	number of nodes in solid domain	#1
Studentdrak Member Join Date: Aug 2011 Posts: 53 Rep Power: 15	Hi, I want to know what decides the number and distribution of nodes in a solid domain in a CHT problem.(Like we have y+ for a fluid domain). Thanks

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May 2, 2012, 19:17		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	It is determined by your mesh, obviously. But I think you are asking what should you consider as you mesh a solid body for CHT simulation. In a solid the only thing you are resolving is the temperature gradient. In steady state simulations this is usually much more gentle than any flow gradient, meaning a much coarse mesh is acceptable. In transient simulations you need to resolve the temperature gradient in time and space - if you are trying to resolve a very fast temperature transient then you will need a fine mesh to resolve it. In the unusual case of a transient simulation with a fast temperature gradient inflation layers may be appropriate. Otherwise, a coarser mesh is usually fine as it simply has to resolve the temperature gradients. But as ever, check it with a mesh sensitivity study to check that it is OK.

May 2, 2012, 22:18		#3
Studentdrak Member Join Date: Aug 2011 Posts: 53 Rep Power: 15	Thanks Glenn