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Posts posted by Mrt

  1. 15 hours ago, Ekaterina said:

    What is the physical difference between element densities as 0.8 instead of 1? 

    The penalization technique used is the “power law representation of elasticity properties,” which can be expressed for any solid 3D or 2D element as follows:
    K(r) = K*ρ^p 
    where K and K represent the penalized and the real stiffness matrix of an element, respectively, ρ is the density and p the penalization factor which is always greater than 1.
    In OptiStruct, the DISCRETE parameter corresponds to (p - 1). DISCRETE can be defined on the DOPTPRM bulk data entry. P usually takes a value between 2.0 and 4.0. For example, compared to the non-penalized formulation (which is equivalent to p=1) at ρ=0.3, p=2 reduces the stiffness of the element from 0.3 to 0.09 times the stiffness of the fully dense element. The default DISCRETE is 1.0 for shell dominant structures, and 2.0 for solids dominant structures (the dominance is defined by the proportion of number of elements)

    Ekaterina and tinh like this

  2. 28 minutes ago, nvn said:

    i used on hypermesh at 2D-Mesh min/max. mesh size , but i can define by AcuSolve a global mesh size, because i have one volume, or not ? Additionally i can define curvature parameters, but my question is, is 0,02 m suitable for this model?

    i haven't done mesh fo cfd, i haven't ever worked in acusolve.

    as for me the best way to try=) do cube, and do diffrent approach/mesh size.=)

  3. 37 minutes ago, Chethan Y C said:

     Current Memory (RAM)                                    :   19617 MB
     (Note: MUMPS Solver Allocates Memory Separately.)
     Estimated Minimum Memory (RAM) for Minimum Core Solution:   51571 MB


    try to solve reduced model/part of model.
    it's difficult to search mistake in large model.

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