COMPARISON OF BODY-FITTED, EMBEDDED AND IMMERSED 3-D EULER PREDICTIONS FOR BLAST LOADS ON COLUMNS

摘要

A reinforced concrete, as well as a steel column, were subjected to typical blast loads. The ensuing 3-D compressible flowfields were computed with the same 3-D edge-based FEM-FCT solver using the body-fitted, embedded-mesh and immersed body approach.The resulting pressures and impulses were recorded at stations close to the columns and compared for the different approaches. The results indicate that:[a) The body-fitted and embedded-mesh methods converge to the same results as the gridis refined;b) The 2nd order embedded-mesh method is comparable in accuracy to Uie body-fitted results for grids of similar size;c) In order to obtain results of comparable quality, the 1st order embedded-mesh method requires grids with element sizes on the boundary that are approximately half of those used for the body fitted and 2nd order embedded-mesh approaches;d) The immersed body approach exhibits much more numerical dissipation that the body-fitted and embedded-mesh methods.iTherefore, if the manual labour required to set up a body-fitted domain is excessive, or I computing resources are plentiful, the embedded-mesh approach is a very attractive option.