MINDENS Error 2150

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello, 

I'm doing a topology optimisation where I minimize the compliance and restrict volumfrac to 50%. Now I want to put the minimal density to 45% (->MINDENS =0.45). Unfortunately I get an error message: 'ERROR 2150 ... Invalid volume or mass constraint'

 

Do you know what I'm doing wrong?

 

 

<?xml version="1.0" encoding="UTF-8"?>Fehlermeldung bei volumfrac05 und MINDENS 0,45.JPG

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2017

    Hi @fabistud

     

    Why do you want to use 45% as MINDENS?

     

    I think this is moving the mass that can be used for optimization to negative. You need to reduce the MINDENS.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2017

    Hi Prakash Pagadala,

    the problem is that I have different types of concrete with different densities. The lightest one has 45% of the density of the heaviest one. My idea was to do a topology optimization after which I can evaluate where I should put the different concrete types. The aim ist to reduce the weight of a concrete beam to an optimum. 

    When I start the topology optimisation without any MINDENS setting, the lowest density is 1%. So I want these lowest densities set to 45%.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2017

    @fabistud

     

    In that case, try reducing the MINDENS or increase the volume fraction for design space to move the material limit from negative.

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