Subject: Re: Meshing Problem Author: schellapa42_at_tntech.edu Date: 2008-10-15 18:40:38Dear Altidis,
Thank you for the suggestion. I am trying the axis symmetric modeling doing just 1/4 model. I am still having problems but this time just 8 elements failed the shape testing. Trying to rectify it
Regards, Samgopiraj Yadav,
MS - Mechanical Engineering, Tennessee Technological University Cookeville. Email: schellapa42_at_tntech.edu
---- Original message ---- >Date: Fri, 03 Oct 2008 10:55:55 -0400 >From: "Altidis, Paraschos C." >Subject: Re: [Xansys] Meshing Problem >To: ANSYS User Discussion List > >Is there any possibility of symmetry plane(s) that will allow you to run >your model with just a segment with proper symmetry boundary conditions >? >This will reduce the size of the model. Can't guarrantee that you woill >not exceed the model size limits of your Ansys version. > >Good luck, > >Paris Altidis >BELCAN Engineering Group >Adv. Engineering & Technology Division >630-786-0008 >============================== >The human bio neural net excels because of: >-Planning ; -Perseverance ; -Passion ; -Pictures! >Alex. H. Slocum - MIT >-It is the privilege of knowledge to speak and it is the privilege of >wisdom to listen. >Oliver Wendell Holmes > > > > >-----Original Message----- >From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On >Behalf Of cylinzv_at_tsmc.com >Sent: Friday, October 03, 2008 1:00 AM >To: ANSYS User Discussion List >Subject: Re: [Xansys] Meshing Problem > >Hi Samgopiraj, > >What element type did you use? SOLID70? SOLID90? From your description >the geometry of the model seems pretty simple. I don't quite understand >what you mean by "negative radius error", but it seems your ANSYS is a >limited version as it will not allow a model with elements more than a >certain amount. A simple way to estimate total number of elements may be >like this: > >Suppose your element size is 50 (by issuing [ESIZE,50]) with SOLID70, >then your plane of size 14000 x 18000 will have 280 x 360 = 100800 >elements, while your thickness direction will have 40 elements (with >thickness = 2000). Your next layer of 160 thickness will have 4 >elements, and the next layer of 23 thickness will have 1 element. That >is to say, your total elements will be 100800 x (40+4+1) = 4536000. An >educational license may not be able to handle such huge model, according >to my past experience. > >Sub-modeling may be a way to resolve this kind of problem where you have >dimensions in different orders of magnitude existing in one model. The >bottom line, however, is that you might wish to think over for what >exactly you want to simulate and ask "is this modeling approach >appropriate to my problem?" > >By the way, if you could post some codes of your input, perhaps you will >get more specific feedback. Thanks. > > >Best regards, > >Chung-yi 'Charles' Lin > >Principal Engineer >Modeling & Reliability Program >Taiwan Semiconductor Manufacturing Company, Ltd. >6 Creation Rd. 2, Hsinchu Science-Based Industrial Park Hsinchu, Taiwan >30077 > > > > > > > xansys-bounces_at_xa > > nsys.org To: >xansys_at_xansys.org > > Sent by: cc: > > xansys-bounces_at_xa Subject: [Spam] [Xansys] >Meshing Problem > nsys.org > > > > > > 10/03/2008 11:17 > > Please respond to > > ANSYS User > > Discussion List > > > > > > > > > >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 > > > >------------------------------------------------------------------------ >--- > TSMC PROPERTY > > This email communication (and any attachments) is proprietary >information > for the sole use of its > > intended recipient. 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