Volume 6, Number 3, 193-203, DOI: 10.1007/BF02487640

NND schemes and numerical simulation of axial symmetric free jet flows

Zhang Hanxin and Fu Lin

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Abstract

Through a study on one-dimensional Navier-Stokes equations, it was found that the spurious oscillations occuring near shock waves with finite difference equations are related to the dispersion term in the corresponding modified differential equations. If the sign of dispersion coefficient is properly adjusted so that the sign changes across shock waves, the undesirable oscillations can be totally suppressed. Based on this finding, the non-oscillatory, containing no free parameters and dissipative shheme (NND scheme) is developed. This scheme is one of “TVD”. The axisymmetric free jet flows are simulated numerically using this scheme. The results obtained by the present scheme are compared with the experimental picture. It is shown that the agreement is very good, and that this scheme has advantages of high resolution for capturing shocks and contact discontinuities.

Key Words  numerical simulation - free jets - TVD scheme - Euler and NS equations

Project supported by National Science Foundation of China

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