We consider the evolution of hexagonal convection patterns governed by
non-potential amplitude equations in the particular case of the Bouss
inesq approximation. The amplitude equations contain new terms which c
an produce non-equilateral hexagonal patterns based on a resonant tria
d with different lengths of wave vectors. The stability regions of dif
ferent kinds of patterns have been obtained. Non-stationary solutions
are also studied. (C) 1998 Elsevier Science B.V. All rights reserved.