论文信息 - A non-linear extension of the mixed spectral finite difference model for neutrally stratified turbulent flow over topography

A non-linear extension of the mixed spectral finite difference model for neutrally stratified turbulent flow over topography

A non-linear extension of the mixed spectral finite difference model for neutrally stratified surface-layer flow over complex terrain is developed. The non-linear terms are treated as additional source terms in the present model. The solution is calculated iteratively in spectral space, while the source terms are evaluated in physical space (at each iteration step) with the help of a Fast Fourier Transform algorithm.Results for simple 2D sinusoidal topography are shown to compare well with full non-linear finite difference results. The method, compared to conventional finite difference methods, has the advantage of rapid convergence and substantial savings in computer time.

Peter A. Taylor | Dapeng Xu | P. Taylor | Dapeng Xu

[1] S. R. Karpik,et al. An improved method for integrating the Mixed Spectral Finite Difference (MSFD) model equations , 1988 .

[2] P. A. Taylor,et al. Some numerical studies of surface boundary-layer flow above gentle topography , 1977 .

[3] J. Hunt,et al. Turbulent wind flow over a low hill , 1975 .

[4] Peter A. Taylor,et al. A mixed spectral finite-difference model for neutrally stratified boundary-layer flow over roughness changes and topography , 1987 .

[5] James R. Salmon,et al. A simple model of neutrally stratified boundary-layer flow over real terrain incorporating wavenumber-dependent scaling , 1983 .

[6] J. Walmsley,et al. A simple model of neutrally stratified boundary-layer flow over complex terrain with surface roughness modulations (MS3DJH/3R) , 1986 .