**3.1.5 Initial and boundary conditions**

The freestream conditions for each trajectory point are enumerated in Table 3, which are used as initial conditions. The subscript represents freestream value in Table 3.


Table 3. Trajectory points and initial conditions.

Four types of boundary conditions are required for the computation of flow field, i.e. wall, inflow, outflow and symmetric conditions. They are prescribed as follows. At the solid wall, no-slip condition is enforced together with an isothermal wall condition. At the centre line of the symmetric reentry capsule are prescribed For the supersonic outflow case, all flow variables are extrapolated at the outer and wake region of the computational region.

### **3.2 Reentry capsule geometry**

### **3.2.1 ARD capsule**

The dimensional detail of the ARD capsule is having an axisymmetric design with a spherical blunt nose diameter, D = 2.8 m, spherical cap radius, RN = 3.36 m and a shoulder radius, RC = 0.014 m. The back shell has inclination angle N = 33 deg relative to the capsule's axis of symmetry. A frustum of cone of radius 0.0507 m with a 12 deg half angle cone is attached to the base region. The overall length of the capsule L = 2.04 m. The ARD resembles a 70% scaled version of the Apollo capsule (Liever et al. 2003).
