Verification Test of the SURF and SURFplus Models in xRage: Part II

Menikoff, Ralph¹ 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: detonation wave;    Taylor wave;    ZND profile;    verification;    SURF;   

DOI  :  10.2172/1258358
RP-ID  :  LA-UR--16-24352
PID  :  OSTI ID: 1258358

学科分类：数学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The previous study used an underdriven detonation wave (steady ZND reaction zone profile followed by a scale invariant rarefaction wave) for PBX 9502 as a validation test of the implementation of the SURF and SURFplus models in the xRage code. Even with a fairly fine uniform mesh (12,800 cells for 100mm) the detonation wave profile had limited resolution due to the thin reaction zone width (0.18mm) for the fast SURF burn rate. Here we study the effect of finer resolution by comparing results of simulations with cell sizes of 8, 2 and 1 ??m, which corresponds to 25, 100 and 200 points within the reaction zone. With finer resolution the lead shock pressure is closer to the von Neumann spike pressure, and there is less noise in the rarefaction wave due to fluctuations within the reaction zone. As a result the average error decreases. The pointwise error is still dominated by the smearing the pressure kink in the vicinity of the sonic point which occurs at the end of the reaction zone.