3 Numerical Simulation of Flow Structure Near Descent …
31
A strong vortex movement occurs in the region of the lateral surface of the descent
module. The unsteady nature of the flow in this region and near wake leads to nonstationary behavior of the aerodynamic characteristics. Thus, in particular, Fig. 3.6
shows the time behavior of the coefficient of moment m z (which is calculated relative
to the axis coinciding with the z axis). When calculating the coefficient of the moment
acting on the descent module, the moment value was related to the ρ ∞ V
2
∞ /2, midsection area and length L 1 .
The non-stationary flow on the lateral surface of the descent module leads to a
loss of axial symmetry of the flow. Thus, Fig. 3.7 shows the profiles of the pressure
Fig. 3.6 Coefficient of
moment m z behavior over
time
Fig. 3.7 Pressure coefficient
C p on the lateral surface of
the descent module: 1 x =
0.5, 2 x = 0.6, 3 x = 0.8, 4
x = 1.0
31
A strong vortex movement occurs in the region of the lateral surface of the descent
module. The unsteady nature of the flow in this region and near wake leads to nonstationary behavior of the aerodynamic characteristics. Thus, in particular, Fig. 3.6
shows the time behavior of the coefficient of moment m z (which is calculated relative
to the axis coinciding with the z axis). When calculating the coefficient of the moment
acting on the descent module, the moment value was related to the ρ ∞ V
2
∞ /2, midsection area and length L 1 .
The non-stationary flow on the lateral surface of the descent module leads to a
loss of axial symmetry of the flow. Thus, Fig. 3.7 shows the profiles of the pressure
Fig. 3.6 Coefficient of
moment m z behavior over
time
Fig. 3.7 Pressure coefficient
C p on the lateral surface of
the descent module: 1 x =
0.5, 2 x = 0.6, 3 x = 0.8, 4
x = 1.0