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RAM C-II spacecraft

Axially-symmetric mesh | Weakly-ionised flow

  Will soon be available

  See Section 5.3. RAM-C Spacecraft in
G. Yang, "Finite Element Simulation of Weakly Ionized Hypersonic Flows," Master's thesis, McGill University, Montreal (Canada), 2022   [PDF→]

1. CASE SETUP

1.1 Geometry & Mesh

Geometry of the RAM C-II spacecraft

Views of the structured mesh (entire domain and magnified view of the nose region) composed of 11,613 hexahedra with a first layer height equal to 1 x 10-5 m.

1.2 Case conditions

The non-slip RAM C-II capsule’s surface is maintained at a temperature of 1200 K. The freestream conditions are given in 0/include/initialConditions:

  • Ma∞ = 23.9
  • Knov = 0.0012
  • ReRn = 0.975 x 104
  • p∞ = 19.719 Pa
  • Ttr, ∞ = 244 K
  • Tve, ∞ = 244 K
  • U∞ = (7651 0 0) m/s
  • YN2, ∞ = 0.767
  • YO2, ∞ = 0.232

1.3 Thermo-chemical and transport models

This test case is using the following thermo-chemical and transport models:

  • thermally-perfect gas (including electronic energy contribution)
  • 7-species gas, Park 1993 chemistry dataset
  • two-temperature model
    • V—T energy transfer: Landau-Teller, tabulated Millikan-White coefficients, Park’s correction
    • H—e energy transfer: Appleton-Bray
    • chemistry-vibration coupling: Park TTv model
  • species viscosity: Blottner
  • species thermal conductivity: Eucken
  • mixing rule: Wilke
  • species diffusion: Lewis number = 1.4
  • laminar flow

1.4 Time controls

The initial time-step is set to 1 x 10-10 s and the maximum CFL number is 0.2. The simulation is run until convergence.

 

2. RUNNING

The following commands will execute fluentMeshToFoam, checkMesh and hy2Foam in serial

./Allclean  
./Allrun

To run hy2Foam in parallel (say on 8 CPUs), please first edit the numberOfSubdomains in the system/decomposeParDict dictionary and type in

./Allclean  
./Allrun 8

 

3. FLOW VISUALISATIONS IN PARAVIEW

 

4. SOLUTION

On the following graphs, the tutorial case results are given by the red solid lines:


Additional references

L. C. Scalabrin, "Numerical Simulation of Weakly Ionized Hypersonic Flow over Reentry Capsules," PhD thesis, University of Michigan, Ann Arbor (US), 2007   [PDF→]

E. Farbar, I. D. Boyd, M. Kim, and A. Martin, "Investigation of the Effects of Electron Translational Nonequilibrium on Numerical Predictions of Hypersonic Flow Fields," 42nd AIAA Thermophysics Conference (Honolulu, Hawaii, US, 27-30 June 2011), AIAA Paper 2011-3136, 2011   [AIAA Portal→]


Contributors: Dr Vincent Casseau and Gan Yang