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Subject: Re: Meshing Problem - Mr. Metrisin
Author: schellapa42_at_tntech.edu
Date: 2008-10-15 18:24:48

Dear Metrisin,

I found your suggestion very helpful. Thank you so much. Have you done thermal cycling problems for the TBC's you work on?. I am modeling the behavior of a TBC for a thermal cycle. I want to know if the following code is correct
TIMINT,ON
TREF,24
*DO,I,1,20
BFUNIF,TEMP,700
TIME,21+(I-1)*70
SOLVE
BFUNIF,TEMP,700
TIME,I*70
SOLVE
BFUNIF,TEMP,24
TIME,10+I*70
SOLVE
*ENDDO

Thank you again for your help
Regards,
Samgopiraj Yadav,

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


---- Original message ----
>Date: Mon, 06 Oct 2008 12:58:44 -0400
>From: "Metrisin, Joe"
>Subject: Re: [Xansys] Meshing Problem - Mr. Metrisin
>To: ANSYS User Discussion List
>
>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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