By heat convection, we mean the term
 

                where     r0 is the density of gas
                                cp is the heat capacity
                                v is the vector of velocity of gas flow
                                grad is the gradient operator
                                T is the temperature.

By default, heat convection item is neglected.

The menu recalls the current status for heat convection, and allows the user to change it.

Such a non-linearity can lead to the loss of convergence of the iterative technique at high Peclet numbers; an evolution scheme may be necessary.