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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국자동차공학회 한국자동차공학회논문집 자동차공학회논문집 제6권 제2호
발행연도
1998.3
수록면
12 - 20 (9page)

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초록· 키워드

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Exterior ballistics of a typical high-speed projectile is studied through a flow-visualization experiment and an unstructured grid Navier-Stokes computation. Experiment produced a schlieren photograph that adequately shows the characteristic features of this complex flow, namely two kinds of oblique cone shocks and turbulent wake developing into the downstream. A hybrid scheme of finite volume-element method is used to simulate the compressible Reynolds-Averaged Navier-Stokes solution on unstructured grids. Osher's approximate Riemann solver is used to discretize the convection term. Higher-order spatial accuracy is obtained by MUSCL extension and van Albada type flux limiter is used to stabilize the numerical oscillation near the solution discontinuity. Accurate Galerkin method is used to discretize the viscous term. Explicit fourth-order Runge- Kutta method is used for the time-stepping, which simplifies the application of MUSCL extension. A two-layer k- ε turbulence model is used to simulate the turbulent wakes accurately. Axisymmetric flow and two-dimensional flow with an angle of attack have been computed. Grid-dependency is also checked by carrying out the computation with doubled meshes. 2-D calculation shows that effect of angle of attack on the flow field is negligible. Axi-symmetric results of the computation agrees well with the flow visualization. Primary oblique shock is represented within 2-3 meshes in numerical results, and the varicose mode of the vortex shedding is clearly captured in the turbulent wake region.

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