Abstract
The use of CFD codes has become widespread to solve the shockwave propagation problem, as they are able to successfully model explosions. Using the structured grid spherically and cylindrical charges cannot be modelled in 3D, thus remapping techniques have been developed to map spherical shockwaves from 1D to 2D and then to 3D. This method highlights the importance of the accuracy of the 1D model, which is mainly dependent on the mesh size. This study aims at finding the required division ratio for the calculation domain.
Highlights
Apart from the empirical formulas for shockwave parameters mentioned in TM5–1300 (De- partment of the Army, Navy and the Air Force, 1990), there is a growing use of more ad- vanced techniques in blast effects engineering
Accuracy mainly depends on the mesh size, so the aim of this study is to carry out a convergence study for this problem, in order to determine the necessary mesh size for accurate results
In the tables N shows how many cells were formed in the domain, cell size is the exact size of one cell in this study, and charge domain division shows how many parts are the charge divided into due to N
Summary
Apart from the empirical formulas for shockwave parameters mentioned in TM5–1300 (De- partment of the Army, Navy and the Air Force, 1990), there is a growing use of more ad- vanced techniques in blast effects engineering. Remapping is a procedure where we calculate the explosion of a spherical charge only in 1D, and when it hits the ground, or any obstacle ― and the problem turns into a 2D or 3D problem ― we switch to the spatial solver, and copy the available 1D domain into the 3D model with all specific transport parameters. This way the spherical or cylindrical propa- gation of a shockwave can be handled in the 3D structured grid. The model setup is discussed, the results are presented, and the convergence study is carried out based on the analysis results, and a conclusion is made and the required cell size is described
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