Numerical Simulations of Internal Wave Generation by Convection in Water

摘要: Water's density maximum at 4C makes it well suited to study internal gravity wave excitation by convection: an increasing temperature profile is unstable convection below 4C, but stably stratified above 4C. We present numerical simulations of a water-like fluid near its in two dimensional domain. successfully model the damping waves using linear theory, provided we do not take weak limit typically used literature. In order isolate physical mechanism exciting waves, use novel spectral code Dedalus run several simplified our more detailed simulation. data from full simulation as source terms models bulk convective Reynolds stresses, and interface forcing via mechanical oscillator effect. find excellent agreement between generated implementing mechanism. The over excite high frequency because they assume "impulsive" penetration plumes, which spreads energy frequencies. However, real instead "sweeping" motion plumes parallel interface. Our results imply that very accurate heuristic for generation convection.