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Subject: Re: Hex & Tet elements
Author: John Swanson
Date: 1998-12-15 19:20:00Have you looked at the tools for refining a tet mesh along a given
line or area which were added at 5.4? They have been useful for
boundary layer specification in CFD, so they might also be useful
in a fine mesh near the surface for sharp thermal gradients.
You mesh the model with a normal mesh, than refine
the mesh near the critical heat transfer surfaces. The
process is fast and automatic.
John.Swanson
> -----Original Message-----
> From: Martin Liddle [SMTP:martin@t...]
> Sent: Tuesday, December 15, 1998 6:02 PM
> To: xansys@o...
> Subject: [xansys] Re: FW: Hex & Tet elements
> From: Martin Liddle
> In article
> <7D70697C0E38D111B4FF080036B39A03AAE5E1@n...>,
> John Swanson writes
> >From: John Swanson
> > With mid-side node elements (10 node tet, 20 node bricks), the
> >results should be the same (very close) for the same nodal density.
> >The tet mesh will have more nodes because of the nodes in the
> >center of the faces and in the center of the brick, and therefore
> will
> >be somewhat more accurate.
> > The advantage of fully automatic mesh generation offered by the
> >tet elements normally outweighs the additional time the solution
> >might take (computers are cheaper than people, and time is always
> >critical).
> >John.Swanson
> I agree with what John says as far as it goes. However in practice
> the
> difficulty with a tet mesh is in controlling the mesh refinement. I
> do
> a lot of thermal stress analysis with steep temperature gradients near
> the surface and it can be difficult to get a tet mesh that is
> sufficiently refined in the through thickness direction. It can be
> much
> more difficult to mesh a given geometry with bricks but much easier to
> control the mesh refinement.
> Martin Liddle, Tynemouth Computer Services, 27 Garforth Close,
> Cramlington, Northumberland, England, NE23 6EW.
> Phone and fax: 01670-712624.