THE EFFECT OF NONORTHOGONAL GRIDS ON SPRAY AND AIR-FLOW PREDICTIONS

This paper describes the effect of non-orthogonal grids on both spray and air flow predictions, and the effect of higher order convection sc heme on inclined grids. In order to assess the effect of non-orthogona lity of grids a number of different grid cases are generated, and appl ied to the same conditions of injected sprays. The effects on the free /wall spray penetration and Sauter mean diameter(SMD) are discussed. T he results show that the numerical error is increased with increasing non-orthogonality, and that Hybrid is better than QUICK for the calcul ation of sprays on inclined grids. For the calculation of the spray in jection, which has always large gradient regions at the front end, ada ptive grids following the direction of spray/ gas flow might be requir ed.