Jump to content
Sign in to follow this  
RAMGANESH

Energy Error

Recommended Posts

Dear ALL

 

I am performing the crash analysis ( Roll over) in Radioss , during solving facing the energy error issue which is increasing in -ve percentage.

 

Please provide your guidelines

 

Thanks

RAM

energy ERROR.JPG

Share this post


Link to post
Share on other sites
Guest

Hi Ram,

 

Negative energy is seen when energy is dissipated from system.  There could be lot of reasons for the same, it could be because of damping or hour glass, etc...

 

 

Review the results and see the whether they are realistic or not. Also try to use physical stabilization to reduce hour glass deformations. 

Energy_Error_Explained__RadiossHelpFiles.jpg

Share this post


Link to post
Share on other sites
Guest

Ram,

 

Normal hourglass  energy valid upto -15% as per help. Keep the analysis going and review the results at the end. 

Share this post


Link to post
Share on other sites
Guest

Hi Ram,

For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified. The gap of the interface should be verified. Try with slightly increased Gapmin value and also keep Inacti to 6.

Meanwhile also check for any penetrations in that interface. 

Share this post


Link to post
Share on other sites

Dear George,

 

I have used the values as shown in image for my contact definition Type 7

 

if i changed inacti to 6 it shows error in initial penetration in interface....

 

Please provide your guidelines and suggested the values to be used for Type 7 contact

 

Thanks

RAM

Type7.JPG

Share this post


Link to post
Share on other sites
Guest

Hi Ram,

Increase Gaping to 0.5 and try running the analysis. Keep the inacti to 6. Import the model into HyperCrash and you can check for the penetrations in the solver interfaces. You can depenetrate the nodes automatically over there. 

Please check the Help Menu on check solver interfaces for HyperCrash also which explains the same.

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...