Amplitude equations for three-dimensional double-diffusive convection in the neighborhood of Hopf bifurcation points

Three dimensional double-diffusive convection in a horizontally infinite layer of an uncompressible liquid is considered in the neighborhood of Hopf bifurcation points. A system of amplitude equations for horizontal variations of the amplitude of a square type convective cells is derived by multiple-scale method. An attention is paid to an interaction of convection and horizontal curl. Different cases of the derived equations are discussed.