The Boussinesq equations describe the motion of an incompressible viscous fluid subject to convective heat transfer. Decay rates of derivatives of solutions of the three-dimension-al Cauchy problem for a Boussinesq system are studied in this work.
"The Cauchy problem and decay rates for strong solutions of a Boussinesq system." Abstr. Appl. Anal. 2005 (7) 757 - 766, 26 September 2005. https://doi.org/10.1155/AAA.2005.757