a	bilinear form	w	mapping difference
A	a mapping	W	temperature space
c	trilinear form	x	dimensionless coordinate
C	concentration	X	velocity space
$D_a$	Darcy number	y	dimensionless coordinate
$D_c$	mass diffusivity	$\mathbf{Greeksymbols}$
e	iterative error of velocity	${\beta }_T$	thermal expansion coefficient
f	forcing function	${\beta }_C$	solutal expansion coefficient
g	gravitational acceleration vector	$\beta$	positive constant
h	mesh size	$\gamma$	heat diffusivity
H	dual space	$\psi$	test function for temperature
k	iterative step	$\sigma$	uniqueness condition
K	triangular region	$\lambda$	constant[0,1]
L	Lebegue space	$\nu$	viscosity
m	$m=\left|\mathbf{g}\right|max\{\left|{\beta }_T\right|,\left|{\beta }_C\right|\}$	$\alpha$	Poincaré constant
M	pressure space	$\eta$	iterative error of pressure
n	iterative step	$\delta$	iterative error of concentration
N	constant	$\xi$	iterative error of temperature
p	fluid pressure	$\mathbf{Subscript}$
P	polynomial	i	1,2
q	test function for pressure	h	finite element discretization
Q	concentration space
s	test function for concentration
T	temperature
u	velocity field
v	test function for velocity
V	subspace of the velocity space