4 Computational Fluid Dynamics
303
system to non-orthogonal coordinate system. Therefore, in order to overcome
some weaknesses of the staggered grid introduced by the chessboard pressure
field, in 1982, Rhee and Chou proposed the non-staggered grid method. This
method draws on the successful experience of staggered grid and arranges
all the solution variables on the same set of the grid. It is widely used in
the calculation of non-orthogonal curvilinear coordinate system. In order to
deal with the coupling correlation algorithm of velocity and pressure in the
calculation of incompressible flow field, SIMPLER and SIMPLEC algorithms
have been put forward successively.
The rapid development of computational fluid dynamics, in addition to
the solid material conditions brought by the development of computer hardware industry, is mainly due to the limitations of theoretical analysis methods
and experimental methods of fluid mechanics. Due to the complexity of the
problem and the high cost, neither an analytical solution nor experimental
determination can be made, so the CFD method just makes up for the
defects of theoretical and experimental research on complex problems, and
it is highly valued by people with its advantages of low cost and simulation
of complex physics (as shown in Figs. 4.5, 4.6, 4.7, 4.8 and 4.9). In recent
years, a large number of CFD software has been tested, which has greatly
broadened the scope of practical application. A numerical simulation of a
phenomenon carried out on a computer under given parameters is equivalent to a numerical experiment. There have been examples in history where
a new phenomenon was first discovered by CFD numerical simulation and
then confirmed by experiments.
Fig. 4.5 Numerical simulation of vortex field around a large aircraft (from DLR)
303
system to non-orthogonal coordinate system. Therefore, in order to overcome
some weaknesses of the staggered grid introduced by the chessboard pressure
field, in 1982, Rhee and Chou proposed the non-staggered grid method. This
method draws on the successful experience of staggered grid and arranges
all the solution variables on the same set of the grid. It is widely used in
the calculation of non-orthogonal curvilinear coordinate system. In order to
deal with the coupling correlation algorithm of velocity and pressure in the
calculation of incompressible flow field, SIMPLER and SIMPLEC algorithms
have been put forward successively.
The rapid development of computational fluid dynamics, in addition to
the solid material conditions brought by the development of computer hardware industry, is mainly due to the limitations of theoretical analysis methods
and experimental methods of fluid mechanics. Due to the complexity of the
problem and the high cost, neither an analytical solution nor experimental
determination can be made, so the CFD method just makes up for the
defects of theoretical and experimental research on complex problems, and
it is highly valued by people with its advantages of low cost and simulation
of complex physics (as shown in Figs. 4.5, 4.6, 4.7, 4.8 and 4.9). In recent
years, a large number of CFD software has been tested, which has greatly
broadened the scope of practical application. A numerical simulation of a
phenomenon carried out on a computer under given parameters is equivalent to a numerical experiment. There have been examples in history where
a new phenomenon was first discovered by CFD numerical simulation and
then confirmed by experiments.
Fig. 4.5 Numerical simulation of vortex field around a large aircraft (from DLR)