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Positions in CAEP Software Center for High Performance Numerical Simulation (Beijing, China)

Submitted by Rong Tian on

The newly setup "CAEP software center for high performance numerical simulation", located in Beijing, China, is recruiting.

The center is focused on large-scale numerical simulation on petaflops systems such as Tianhe-2 etc.

The R&D of the center spans broad areas of high performance numerical simulation including preprocessing (CAD, mesh generation), parallel visualization, high performance middleware, computational mechanics (nonlinear FEM, GFEM/XFEM, SPH/MPM), mental and energetic materials, nuclear physics, electromagnetics etc. 

Why do we often use Jaumann rate instead of Truesdell rate?

Submitted by Rong Tian on
opinion

In the attachment, we show that Truesdell rate can by simplified to Green-Naghdi rate by assuming F .=. R and can be further simplified to Jaumann rate by assuming W .=. R(.)R(T), where .=. means approximately equal

In a stretch dominant deformation, the three rates give different stress rate. This is usually explained by that we need a different tangential modulus for different objective rate. However, it is hard to understand why we need to change "material" modulus when we use a different "mathematical" form of objective rate as they are all supposed to be equivalent.

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