Element quality check between nastran and optistruct

gopal_rathore
gopal_rathore Altair Community Member
edited October 2020 in Community Q&A

Hi,

I am having a Nastran solver deck and want to run it on optistruct solver. When I see element quality criteria in Nastran , it shows max. as 0.008 but the same in Nastran shows 51.55

 

How these values can interpreted as both decks solvers showing different values.

Any methodology to understand this

 

Thank you

Tagged:

Answers

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited September 2018

    Which criteria???

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018

    Warpage, min. and max. angles of tria and qaud element

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018
    Altair Forum User said:

    When I see element quality criteria in Nastran , it shows max. as 0.008 but the same in Nastran shows 51.55

    I am sorry, in Nastran it shows as 0.008 and in HM with OptiStruct profile it shows as 51.55, is that correct??

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018

    Yes,

    This is the same thing it shows. 

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018

    Hi,

    Any update on this

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    Hi Gopal,

     

    I will check with experts about this. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    Hi Gopal,

     

    Can you let me know which criteria are you looking at?

     

    You have given numbers of 0.008 and 51.5, which quality parameter is it for?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    You can refer this on how element quality is calculated. 

    Unable to find an attachment - read this blog

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018
    Altair Forum User said:

    Hi Gopal,

     

    Can you let me know which criteria are you looking at?

     

    You have given numbers of 0.008 and 51.5, which quality parameter is it for?

    Hi,

    This is for warpage

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018

    Hi, 
    Anything on above points

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    Hi Gopal.

     

    Can you share a sample model with difference in warpage between Nastran and OptiStruct?

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018

    Hi,

    There is one tool in 17 version in Hyperview> Preferences>NVH utilities to understand the identification of global and local modes. It talks about setting a criteria based on percentage range for identification. I wanted to know how it is setting up this criteria 

     

    I have attached image for reference

    <?xml version="1.0" encoding="UTF-8"?>global modes -NVH utilities.JPG

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited September 2018
    Altair Forum User said:

    Hi,

    There is one tool in 17 version in Hyperview> Preferences>NVH utilities to understand the identification of global and local modes. It talks about setting a criteria based on percentage range for identification. I wanted to know how it is setting up this criteria 

     

    I have attached image for reference

    <?xml version="1.0" encoding="UTF-8"?>global modes -NVH utilities.JPG

     

     

    Sorry, this content is wrongly posted.

     

Categories