XANSYS Message: 34721 [Go back to message list] [bookmark on del.icio.us]
No rating yet Subject: Re: Regarding substructuring Author: Dan Bohlen Date: 2002-03-08 10:57:00You could try increasing your -db setting if you are trying to avoid the page file. It should be at least as large as your .db ( + .rst if solving) to avoid a .page file. It's been awhile since I've done any substructuring. Usually the large file sizes were more of a resource issue than memory.
-----Original Message----- Sent: Friday, March 08, 2002 3:57 PM To: xansys
I am giving total workspace as 1650 and db size 32. I have very high end machine 2 GB ram 136 GB harddisk.
Thanks
Regards
Somesh
At 10:06 AM 08/03/2002 -0500, you wrote: >Page file - what sort of -m and -db are you starting Ansys with?
>Again we have a confusion. I have a big volume having 90000 elements. >I have selected only boundary nodes those are around 3000. I have around >9000master dof's. But the system is creating a huge page file and its not >solving in the gereration pass.
>Thanks
>Regards
>Somesh
>At 09:04 AM 3/7/02 -0500, you wrote: >> I don't understand "the frontal solver can solve only 50000 DOFs" - >>there >>is no such limit. Perhaps you mean what the solver can only handle 50000 >>master DOFs? If so, this sounds like an extremely large number. Is it >>possible >>that you have set all DOFs to be masters rather than just some boundary or >>loading nodes? >>John Swanson >>Swanson Analysis Services, Inc.
>>> -----Original Message----- >>> From: Somesh J. Ghunakikar [SMTP:someshjg@i...] >>> Sent: Thursday, March 07, 2002 9:11 PM >>> To: xansys >>> Subject: RE: [xansys] Regarding substructuring
>>> I have a single volume meshed with 50000 elements, I can not solve in >>> generation pass, its coming out by giving watson error. Since the frontal >>> solver can solve only 50000 DOF's. The problem is I can not divide the >>> volume also. >>> Again in the use pass, while solving its taking only frontal solver. But >I >>> need atleast sparse. I need an iterative solver in the use pass. How I >can >>> do it.
>>> Thanks
>>> Regards
>>> Somesh
>>> IEL, Hyd. >>> India
>>> At 08:01 AM 07/03/2002 -0500, you wrote: >>> > A slightly longer answer is that substructure generation is a partial >>> >factoring of the set >>> >of equations, down to the set of Master DOFS. The other solvers in >>> ANSYS, >>> >both iterative >>> >and direct, do not have this capability, which leaves you with the >>> frontal >>> >solver. >>> > Direct solvers might be modified to have this capability (Sparse, >for >>> >example), but I have >>> >not seen any research on how this might be done with an iterative >solver. >>> >John Swanson >>> >Swanson Analysis Services, Inc.
>>> >> -----Original Message----- >>> >> From: Bohlen, Dan (GEAE) [SMTP:dan.bohlen@a...] >>> >> Sent: Wednesday, March 06, 2002 11:33 AM >>> >> To: 'xansys ' >>> >> Subject: RE: [xansys] Regarding substructuring
>>> >> I believe the short answer is: you can't.
>>> >> -----Original Message----- >>> >> From: Somesh J. Ghunakikar [mailto:someshjg@i...] >>> >> Sent: Tuesday, March 05, 2002 6:14 PM >>> >> To: xansys >>> >> Subject: [xansys] Regarding substructuring
>>> >> Dear Users >>> >> In substructuring , the generation pass has only frontal solver? How >>> we >>> >> can change the solver instead of frontal in generation pass.