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R&D Journal

On-line version ISSN 2309-8988
Print version ISSN 0257-9669


COMBRINCK, M; DALA, L  and  LIPATOV, I. Non-inertial forces in aero-ballistic flow and boundary layer equations. R&D j. (Matieland, Online) [online]. 2017, vol.33, pp.85-96. ISSN 2309-8988.

This paper derives the non-inertial terms, also referred to as fictitious forces, for aero-ballistic cases using an Eulerian approach. These cases display unsteady rates ofchange in acceleration in all six degrees offreedom. Six fictitious forces are identified in the momentum equation. Their origin and nature ofthese forces are elaborated upon. As shown in previous work, the continuity and energy equations remain invariant. The non-inertial boundary layer equations are derived to determine the effect of fictitious forces in the near-wall region. Through an order of magnitude analysis it was determined that none of the fictitious forces cancels out. It will therefore have an influence on the boundary layer properties.

Keywords : Coriolis force; Centrifugal force; Euler force; Magnus force; Reference frames; Galilean invariance; Rotational transform.

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