FEAP User Forum

FEAP => Programming => Topic started by: nima_ikm on November 22, 2015, 02:55:46 PM

Title: Tied interface for non conformal mesh
Post by: nima_ikm on November 22, 2015, 02:55:46 PM

Dear Professor Taylor and Feap users,

I would like to glue two different interface for non-matching discrete interface. I think this can be done through Tied command based on Dual LG.

However, I have tried to tie two different interface (material 1 and material 2) like contact patch test (just gluing two different domain). Please find corresponding input file and mesh. Unfortunately, this does not work. I would be appreciate  if you could help me in this regard. Thanks a lot :)

P.S I would like to glue two interface through Dual LG and not  penalty method. This is not contact problem and just dealing with non-matching interface.

Best regads

Title: Re: Tied interface for non conformal mesh
Post by: Prof. R.L. Taylor on November 22, 2015, 03:30:03 PM

Did you try with the direct solver?  Maybe the iterative one will not work?

Title: Re: Tied interface for non conformal mesh
Post by: Prof. R.L. Taylor on November 22, 2015, 04:34:53 PM

YOU did not post eleR

Title: Re: Tied interface for non conformal mesh
Post by: nima_ikm on November 22, 2015, 11:23:16 PM

Dear Professor,

Thank you very much for all your kindness and valuable help to us. :) Yes, I have tried without iterative solver and it does not work.

Please find input file and mesh in the attachment. I include two input file and removing iterative solver. One corresponds to penalty method which works fine  and next one corresponds to Lagrange multiplier which it does not work. To make it clear, the difference between two input file are as follows:

           ilagrange                                         ipenalty
  =============================================
         TIED 1 2 4                                        NTOS 1 2
        SOLM LAGM                            SOLM PENAlty 1.E+05                     
     
       block segment                                     FACEts

Again, very much for all your help and kind answer. :)

Best wishes

Title: Re: Tied interface for non conformal mesh
Post by: Prof. R.L. Taylor on November 23, 2015, 11:38:49 AM

Attached is a file that works.  One hint:  surfaces must be defined by traversing 2-d boundaries counter-clockwise for both surfaces.  ALWAYS check the output file for what the program found from your input.

Title: Re: Tied interface for non conformal mesh
Post by: nima_ikm on November 23, 2015, 12:59:11 PM

Dear Professor Taylor,

I am very appreciated for all your kindness and your kind correction. Thank you very much and I am really grateful :)

Best wishes