Evolution of turbulent fields in explosions [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Defense, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- 22 pages : digital, PDF file
- Additional Creators
- United States. Department of Defense and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- Explosions always contain turbulent mixing regions, e.g.: boundary layers, shear layers, wall jets and unstable interfaces. The inherent unsteadiness of turbulent mixing in explosions, and the lack of sufficient data, pose insurmountable difficulties for turbulence modeling of such flows. Proposed here is a direct numerical simulation approach-where the three-dimensional (3-D) conservation laws are integrated via a high-order Godunov method. Adaptive Mesh Refinement (AMR) is used to Capture the convective mixing processes on the computational grid. Then, an azimuthal-averaging operator is applied to the 3-D solution-in order to extract the instantaneous mean and fluctuating components of the turbulent field. This methodology is applied to the numerical simulation of the turbulent wall jet and dusty boundary layer flow induced by a point explosion above a ground surface. Principal results include the evolution of the turbulent velocity field near the surface. During the wall jet phase, the mean profiles resemble our previous two-dimensional calculations, while the velocity fluctuation profiles and Reynolds stress profiles are qualitatively similar to measurements of self-preserving wall jets. During the boundary layer phase, the mean velocity profile evolved with time, e.g.: initially it agreed with measurements of a dusty boundary layer behind a shock; at intermediate times it resembled the dusty boundary layer profiles measured in a wind tunnel; while at late times, it approached a l/7 power-law profile. Velocity fluctuation profiles were qualitatively similar to those measured for a turbulent boundary layer on a fiat plate. The methodology can be used to predict the evolution of other turbulent fields such as dust clouds, axisymmetric jets, fireball instabilities, and dusty boundary layers in shock tube and wind tunnel flows.
- Report Numbers
- E 1.99:ucrl-jc--115923
E 1.99: conf-940181--1
conf-940181--1
ucrl-jc--115923 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
12/01/1993.
"ucrl-jc--115923"
" conf-940181--1"
"DE94010405"
Japanese national symposium on shock waves,Chiba (Japan),20-23 Jan 1994.
Collins, J.P.; Bell, J.B.; Ferguson, R.E.; Lyons, M.L.; Kuhl, A.L.; Chien, K.Y.
Lawrence Livermore National Lab., El Segundo, CA (United States) - Funding Information
- W-7405-ENG-48
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