CFD analysis and simulation

Computational Fluid Dynamics (CFD) is one of the major service areas of GEM. This area includes development of an in-house CFD solver, improvement of physics-oriented models, advanced analysis by general CFD packages, and an integration of design to simulation analysis with commercial tools.

Overview of key capabilities in CFD analysis and simulation:

  • Capable of incompressible and compressible flow solver development
  • Implementation of high-order accuracy interpolation scheme in compressible flow solver
  • Comprehensive representation of turbulence modeling
  • Validation of CFD simulation by performing budget check of flow transport equation
  • Supersonic flow, multiphase and porous media flow simulations in general CFD packages
  • Heat transfer analysis of electronic board in commercial tools
  • High performance computing of large-scale CFD problems on advanced computation resource
  • Automatic generating and processing of large-scale computation data
  • Scientific visualization of simulation data via visualization packages

Analysis of Hydrodynamic Instability in High-speed Channel Flow

The perturbation introduced into high-speed transition flow is obtained by solving well-established instability equations. In the high-speed CFD simulation, the evolution of perturbation demonstrates quite different behaviors. This difference is attributed to the strong compressibility effects. In high-speed flow, the initial perturbation develops into broadband spectra quickly. The whole process is simulated by an in-house CFD solver based on gas-kinetic method. In the velocity vector animations, one slice along the streamwise and wall-normal direction is demonstrated. In the velocity contour animation, one slice along the streamwise and span-wise direction is shown.

Perturbation velocity vector evolution at Ma=.12
Perturbation velocity vector evolution at Ma=6

Perturbation development into broadband spectra at Ma=6

CFD simulation of supersonic rocket using general commercial packages

The aerodynamic characteristics of a rocket with wrap-around fins are investigated by CFD analysis using Fluent. A series of aerodynamic configurations are tested in the simulation and different aerodynamic performances are demonstrated. With an orthogonal design method, the effect of six geometrical parameters on aerodynamic characteristics is analyzed.

Figure: 3D model, mesh and pressure distribution on rocket fins

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