Jump to content
Sign in to follow this  
Andy@LamteqSolutions

Increase in demand on Models containing Contracts with Friction

Recommended Posts

Hello,

 

I have been having issues with a model containing contacts and friction. The model is relatively straight forward, a multiple mast model with wearpads and contacts between pad faces and adjacent mast sections.

 

When the contact is set to property type slide N2S, the analysis demands around 47GB for In-Core Solution. However when the type is set to static friction coeff = 0.15, the in-core demand becomes 80GB. The model on my pc then typically fails because MUMPS demands significantly more RAM.

 

I've tried adjusting the search distance and using a PCONT card to define friction with little impact on MUMPS demand.

 

Any suggestions?

I currently have one PARAM card... PARAM,EXPERTNL,CNTSTB 

 

Share this post


Link to post
Share on other sites
Guest

Hi Andy,

 

How big is the model in terms of number of nodes?

 

Can you run without friction and search distance set to auto?

Share this post


Link to post
Share on other sites
Guest

Hi

How are you calculating the search distance?

It is twice the average edge length on the master surface when using contact type Slide.

Share this post


Link to post
Share on other sites
Guest

Hi Andy,

 

 I think the problem is with Search Distance. Can you run with Auto,

Meanwhile I will check with experts about the issue.

Share this post


Link to post
Share on other sites
Guest

@Andy,


Is the .out and screen shot are for same run and same model?

I both cases the memory is not sufficient, though.

Share this post


Link to post
Share on other sites
Guest

@Andy@LamteqSolutions

 

One way is to increase the RAM.

 

Maybe you can change the mesh size, have a finer mesh where contact is required and coarse at areas of non-interest, have contacts only where necessary

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
You are posting as a guest. If you have an account, please sign in.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...