Verification Test of the SURF and SURFplus Models in xRage: Part III Affect of Mesh Alignment

Menikoff, Ralph¹ 

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

关键词: detonation wave;    verification;    SURF;    curvature effect;   

DOI  :  10.2172/1304803
RP-ID  :  LA-UR--16-26317
PID  :  OSTI ID: 1304803

学科分类：数学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The previous studies used an underdriven detonation wave in 1-dimension (steady ZND reaction zone profile followed by a scale-invariant rarefaction wave) for PBX 9502 as a verification test of the implementation of the SURF and SURFplus models in the xRage code. Since the SURF rate is a function of the lead shock pressure, the question arises as to the effect on accuracy of variations in the detected shock pressure due to the alignment of the shock front with the mesh. To study the effect of mesh alignment we simulate a cylindrically diverging detonation wave using a planar 2-D mesh. The leading issue is the magnitude of azimuthal asymmetries in the numerical solution. The 2-D test case does not have an exact analytic solution. To quantify the accuracy, the 2-D solution along rays through the origin are compared to a highly resolved 1-D simulation in cylindrical geometry.