Implicit versus Explicit FEA in parallel computing
Implicit versus Explicit FEA in parallel computing
(OP)
Hello,
I was wondering if anyone here could explain to me in a simple manner why implicit fea benefits less from parallel computing than explicit fea?
Hopefully awaiting intelligently elaborated replies easily understandable by a person whos mothertongue is not english.
-Andreas-
I was wondering if anyone here could explain to me in a simple manner why implicit fea benefits less from parallel computing than explicit fea?
Hopefully awaiting intelligently elaborated replies easily understandable by a person whos mothertongue is not english.
-Andreas-





RE: Implicit versus Explicit FEA in parallel computing
https://www.researchgate.net/post/What_is_differen...
http://www.dynasupport.com/faq/general/what-are-th...
Presumably, it has to do with the stiffness matrix inversion.
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RE: Implicit versus Explicit FEA in parallel computing
I think that is a short and a bit simplified explanation. Hopefully not to simplified.
Thomas
RE: Implicit versus Explicit FEA in parallel computing
In an explicit solution we initially solve for accelerations and only need to invert the mass matrix [M] as opposed to the stiffness matrix [K].
For lower order elements [M] is diagonal.
RE: Implicit versus Explicit FEA in parallel computing
1.) Implicit requires inversion of the stiffness matrix [K]. Implicit requires solving system of variables with more than two unknowns. Which is why the task cannot easily be split up and sent to different nodes/cpu cores.
2.) Explicit requires inversion of the mass matrix [M]. Mass matrix only has diagonal terms, which results in multiple equations each with only one unknown. These equations can easily be solved on different nodes/cpu cores.
Would you agree to above statements?
-Andreas-
RE: Implicit versus Explicit FEA in parallel computing
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Implicit versus Explicit FEA in parallel computing
But it gets better as the algorithms improve since the cpu's don't get faster to the same extent as they "grow" more cores
Also, as Dave442, already mentioned. My description was based om lower order elements with diagonal mass matrix. My experience is based on that type of elements.
Thomas