Lineraly Stratified Flow Past Rotating 2D Ellipses*

Direct Numerical Simulations (DNS) of linearly stratified flow past rotating 2D ellipses have been performed, to quantify the effect of rotation, shape, and stratification on the flow. 

Drag and lift on the rotating body, and the induced flow structures were quantified. Simulations were conducted using high-order Schwarz- spectral element method (Schwarz-SEM),

which facilitates high-fidelity simulations for rotating bodies. Simulations were conducted for Reynolds number = 120, Densimetric Froude number (Fr²) in the range 1000-0.01, theree aspect raptios of the ellipse, and one rate of rotation. This is the first instance in which Schwarz-SEM was being used for simulating stratified flows, thus comparision was conducted against literature and mono-domain simulations. Hilbert tranformation and DMD analysis was also conducted to understand and quantify the internal gravity wave (IGW) formed at higher stratification. These are some of the first high-fidelity simulation of moving bodies in stratified flow.