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Subject: Re: Meshing Problem - Mr. Metrisin
Author: Joe Metrisin
Date: 2008-10-06 16:57:06

Samgopiraj,

If I read your post correctly, you want to model a solid block with two
relatively thin coatings on the surface. You still model your block
with solid elements. I assume solid90's or solid87's. The coatings are
simulated with thermal shells (shell132's) overlaid on the surface of
the solid elements. The shell132's allow you to define multiple layers.
Each layer can be a different material and thickness. You can also
control the number of integration points per layer. If you expect large
thermal gradients through these coatings, you need more integration
points. You must use keyopt(6)=1 which will tie the Tbot (bottom layer
temperature DOF of the shell) to the temperature DOF of the solid
elements.

Joseph T Metrisin
Florida Turbine Technologies, Inc.
1701 Military Trail, Suite 110
Jupiter, FL. 33458-7887
(561) 427-6346

-----Original Message-----
From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On
Behalf Of schellapa42_at_tntech.edu
Sent: Monday, October 06, 2008 11:41 AM
To: ANSYS User Discussion List
Subject: [Xansys] Meshing Problem - Mr. Metrisin

Dear Metrisin,

Thank you for your suggestion. I have never approached the
problem with shell model because i thought the shell would not be the
right option. I have a quick questions to ask you. Could you please
answer me? (i have not done a shell model before)

1. Can a shell be used as a 3D model or should i go for a 2D to deal
with Shell?. My model needed a 3D analysis because the deformation in
all three axes based on cyclic thermal loading.

Thank you for doing this.

Regards,
Samgopiraj Yadav,

MS - Mechanical Engineering,
Tennessee Technological University
Cookeville.
Email: schellapa42_at_tntech.edu


---- Original message ----
>Date: Mon, 06 Oct 2008 07:06:07 -0400
>From: "Metrisin, Joe"
>Subject: Re: [Xansys] Meshing Problem
>To: ANSYS User Discussion List
>
>This problem is best solved by modeling the two layers of coatings with
>shell132 elements overlaid on the solid block. Use keyopt(6)=1 for the
>"paint" application. You can model each coating as a different layer
in
>this element with it's own thickness and material properties. If you
>expect large through thickness thermal gradients, be sure to use
several
>integration points per layer.
>
>Joseph T Metrisin
>Florida Turbine Technologies, Inc.
>1701 Military Trail, Suite 110
>Jupiter, FL. 33458-7887
>(561) 427-6346
>
>-----Original Message-----
>From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On
>Behalf Of schellapa42_at_tntech.edu
>Sent: Thursday, October 02, 2008 11:17 PM
>To: xansys_at_xansys.org
>Subject: [Xansys] Meshing Problem
>
>Dear All,
>
> I am doing a transient thermal analysis of a model with 3
>layers(3D modeling) in Ansys Classic. My inner block is
2000x14000x18000
>units whereas the next engulfing layer is 160 units and the next
>engulfing layer is 23 units. Its actually a block with 2 layers of
>coating. when i gave mesh with the size 0.5 or 1 i got a negative
radius
>error. I guess the element size could not fit in the 3rd layer. when i
>gave the element size low i exceeded the total no of elements allowed.
>How do i tackle this problem. Could anyone help me?
>
>Note: Three layers have different material number(mat properties)
>
>Regards,
>Samgopiraj Yadav,
>
>MS - Mechanical Engineering,
>Tennessee Technological University
>Cookeville.
>Email: schellapa42_at_tntech.edu
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| The Online Community for users |
| of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
^----------------------------------------------------
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