Browse Publications Technical Papers 2019-01-1937
2019-06-10

A Refined In-flight Icing Model and its Numerical Implementation 2019-01-1937

In modern in-flight icing simulation computing the runback flow in a physically realistic way is a very challenging task. In the present paper/talk a refined icing model is proposed whose primary focus lies on an improved prediction of the runback dynamics. The most significant capabilities of the model are: *) Incorporation of surface tension and wetting effects in the runback model *) Fully transient treatment of the ice accretion/depletion process and the runback flow *) Unsteady heat conduction in the accreted ice layer and the underlying substrate as well as phase transitions solid/liquid in the ice layer *) Strict mass- and enthalpy-conservative growth/depletion of the ice layer; (this is achieved by a specially designed mesh adaption algorithm) An essential part of the paper is devoted to the treatment of surface tension and wetting effects: These effects result from certain contributions to the pressure terms appearing in the runback continuity equation, i.e., these effects are inherent properties of the simulated runback dynamics rather than just "imposed" in some way while treating the runback layer as a continuous film. In particular, film rupture, bead formation and bead coalescence are inherent properties of the simulated runback flow, and also contact angle hysteresis effects can be simulated with the current wetting model. Furthermore, the (sophisticated) numerical methods used for the time-integration of the coupled system consisting of the runback continuity equation and the energy equations of the runback layer, the ice layer and the underlying substrate will be described in the paper/talk, and numerical test results (in two spatial dimensions) will be presented.

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