A two-scale approach to widen a predictive blast propagation model around a hemicylindrical obstacle

Gavart, R.; Trélat, S.; Sturtzer, M.-O.; Chaumeix, N.

doi:10.1007/s00193-023-01135-4

Cited by 1 publication

(1 citation statement)

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“…The k-omega (k-ω) model is useful for the prediction of turbulence by using two differential equations of two variables, namely k (turbulence kinetic energy) and ω (specific rate of dissipation of the kinetic energy into thermal energy). Gavart et al [20] studied the characterization of a blast wave generated by a solid explosive and thereafter the interaction with a hemi cylindrical rigid obstacle. Numerical investigation of fluid flow interaction and heat transfer was done by Kolesnik and Smirnovsky [21] for supersonic laminar flow over a fin.…”

Section: Introductionmentioning

confidence: 99%

Computational study of shock diffraction over convex edges

Banerjee,

Halder

2024

Eng. Res. Express

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Numerical analysis of normal shock diffraction over various step corners is presented using an implicit second-order upwind least squares cell-based method. Slipstream angle calculation for various corner angles and Mach numbers, variation of pressure load and specific heat flux with incident shock Mach numbers and different step corners along the step wall, separation point movement, and reattachment of the streamlines are some of the key features of the present study. Detailed studies have been conducted about the perturbed region enclosed within the diffracted shock wave and the last running expansion wave with the increase in the incident shock Mach numbers. The finite Volume Method is used to solve the governing equations numerically for the simulation of the moving shock. Various flow characteristics such as secondary shock, contact surface, expansion wave, slipstream, vortex, etc. are well captured. Apart from isopycnics; Mach contours, isobars, and isotherms are plotted as well. The reattachment region formed after the flow separation near the step edge is mentioned and corresponding lengths over various steps are presented. Separation point movement along the step wall is highlighted and a relevant increase in reattachment length is reported. The slipstream angles get increased with incident shock Mach numbers and with corner angles. However, the rate of increment of slipstream angle decreases gradually. The core of the vortices generated and the reattachment of the separated streamlines are indicated by the two downfalls in the heat flux values.

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Section: Introductionmentioning

confidence: 99%