Virtual memory techniques in Eulerian calculations

Luttwak, Gabi; Cowler, Malcolm S.; Birnbaum, Naury K.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p363
Academic Journal
In an Eulerian formulation, the mesh has to span the space which may be reached by the materials during the calculation. Thus, many more zones are required, than for a similar Lagrangian, body-fitted grid. For typical 3D problems, to achieve an acceptable resolution using traditional Eulerian schemes, the memory requirements may exceed the available resources. We present a virtual memory technique implemented in the Autodyn 3D second order Godunov solver. Using this innovative approach, the empty cells in the mesh need only to store the cell geometry. Only non-empty zones are processed, resulting in substantial gains in both the computational memory, as well as in the speed of the computation. The efficiency and accuracy of the Eulerian virtual memory approach is illustrated by the simulation of the 45° oblique impact of a copper rod, moving at 850m/sec, into an aluminum target and the comparison of the results with published experimental data[SUP(1)].


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