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The pressure‐advection term and additive splitting in split‐explicit models

1995; Wiley; Volume: 121; Issue: 524 Linguagem: Inglês

10.1002/qj.49712152413

1477-870X

Zaviša I. Janjiš, Fedor Mesinger, Thomas L. Black,

Computational Fluid Dynamics and Aerodynamics

Abstract In this note two major points are made. First, pressure advection needs to be carried within the adjustment step of split schemes if conservation of energy in the transformation between kinetic and potential energy is to be made possible. Second, in contrast to several recently published views, additive split schemes, without incremental addition of the advection contributions, are not necessarily noisy, given that the presented scheme is not. an analysis in support of the first point and evidence in support of the second are presented. Finally, several additional remarks regarding the ratio of the adjustment and advection time steps and energy conservation in split‐explicit models are made.