Combustion modeling in two and three dimensions—Some numerical considerations

Abstract The wide disparity in claims for combusting flow prediction models which are based upon numerical solution of a set of governing partial differential equations is examined in the light of potential and observed problem areas encountered in the equation solving process. These numerical difficulties are attributed to such case dependent items as large flow gradients requiring dense meshes, the presence of singular points such as re-entrant corners, and equation stiffness. In simple flows where none of these difficulties is encountered or is mitigated, experience is good and an encouraging level of predictive agreement is observed. Thus there exists considerable motivation to continue to develop the equation solving process so that these difficulties are either minimized or eliminated when encountered in the more practical systems. Techniques which treat some of these problem areas are discussed and their current status reviewed.

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