Abstract:
The design of numerical code for gas-dynamics simulation of aspiration flows
was presented. The choice of method for integration of gas-dynamics equations
was made. Several possibilities for boundary conditions of hydrostatic case
was described.
For simulation of aspiration flows two-dimensional approach was used.
In this case, computational domain is rectangle, that corresponding to vertical
slice of industrial building. Left, right and bottom boundaries are
solid borders. For them we used reflected boundary conditions.
On the top boundary gas free flow is available.
There are several possibilities of boundary conditions on the top boundary:
free flow:
(a) obvious free flow;
(b) free only outflow from computational domain (but not inflow into);
hydrostatic equilibrium:
(a) free flow;
(b) free only outflow from computational domain (but not inflow into).
We perform numerical simulations for all listed variants. The results
showed that minimal change of initial hydrostatic balance was given by
isothermal hydrostatic boundary conditions. And difference between two their
variants is very small.
The two-dimensional numerical code on the base of MUSCL approach and
isothermal hydrostatic balance satisfying boundary conditions was developed
by us. It is possible to support hydrostatic equilibrium in computational domain
with very high accuracy. We think, that this code may be used for tasks of
projecting and optimisation of ventilation systems of industrial building with
success.
Evolution of this code may be in two directions: the full three-dimensional code
and isothermal hydrostatic balance boundary conditions of two order accuracy.