  Heat and momentum transfer of low-Prandtl-number fluid ($Pr=0.029$) in a
closed rectangular cavity ($100\times60\times10$ mm$^3$) heated at one side and
cooled at the opposite side are analyzed. The electromagnetic forces into the
liquid metal are generated by the travelling magnetic field inductor and
directed towards buoyancy forces. Large eddy simulations are performed with the
Grashof number $Gr$ from $1.9\cdot 10^5$ to $7.6\cdot 10^7$ and the
electromagnetic forcing parameter $F$ from $2.6\cdot 10^4$ to $2.6\cdot10^6$.
An experimental validation of the simulation results of vertical convection and
electromagnetically driven flow using GaInSn alloy has been performed. Three
types of flow patterns are obtained for different interaction parameters $ N =
F / Gr $: counterclockwise flow, clockwise flow, and coexistence of two
vortices. Analysis of the Reynolds number shows that the transition zone from
natural convection to electromagnetic stirring lies in the range
$0.02<F/Gr<0.07$ and two braking modes are found. The transition point between
the convective heat transfer regimes is found for $ F / Gr $ around 1. The
analysis of isotherms deformation showed that in such convective systems it is
possible to achieve minimum deviation of the isotherm shape from a straight
line in the range of $ 0.05 <F/Gr <0.2 $.
