Convection and heat/mass transfer in submerged heater crystal growth production technique. The picture corresponds to the case of oscillatory rotating submerged heater. Calculation implies the solution of initial boundary value problem for Navier-Stokes-Boussinesq equations for incompressible viscous fluid. Using code ASTRA this task is primarily solved in 1996 and then investigated in details by Dr. A.I.Fedyushkin in 1997-1998. Code ASTRA.