The aim of this work is to simulate the spreading of an oil film drop driven by flow in an air channel, using two-dimensional and spanwise-periodic three-dimensional computational domains. Computations using recently introduced features for two-phase flow in the Nek5000 code are carried out to model Oil Film Interferometry (OFI) conditions, which is used for accurate surface shear-stress measurements. The work is aimed at revealing the differences between the actual evolution of the oil-air interface with time and the traditionally used low Reynolds number theoretical representation of it. Documenting such differences would help us establish better error estimates in measuring the shear velocity of the air flow along the surface and potentially lead to better accuracy of the OFI technique. Legacy Nek5000 subroutines for such flows were also tested successfully in a three dimensional domain with homogeneous spanwise conditions.
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