NACA Regression Tests
Let's test some of the ProjectX solvers for the case of a NACA0012 (? check ?) airfoil (2D) in compressible, inciscid flow:
Inputs:
- Common flow parameters:
- Freestream Mach number: M ∞ = 0.5
- Angle of attack: α = 0 °
- Total pressure: Pt =
- Total temperature: Tt =
- Static temperature:
- CFL: 1030
- Common solver parameters:
- Preconditioning:
- Outer GMRES iterations (no. restarts): 20
- Inner GMRES iterations (no. Krylov vectors): 200
- Solution order: 2
- PSequencing: False
- Preconditioning:
Boundary conditions:
Input Primal X-Momentum
Tests on linear solvers:
Newton-Jacobi (Left):
- Nonlinear solver:
- Newton
- Preconditioner:
- Block Jacobi (left)
- Serial results:
- Residual norm converges to 4.3571·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
Newton-Jacobi (Right):
- Nonlinear solver:
- Newton
- Preconditioner:
- Block Jacobi (right)
- Results:
- Residual norm converges to 4.3532·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
Newton-ILU
- Nonlinear solver:
- Newton
- Preconditioner:
- Incomplete LU (0) (left)
- Reordering type: Minimum discarded fill
- Side: Left
- Serial results:
- Residual norm converges to 4.3566·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
- Parallel results:
- Residual norm converges to 4.3501·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
Newton-ILUK
- Nonlinear solver:
- Newton
- Preconditioner:
** ?? Incomplete LU (ILUK)- Reordering type: Minimum discarded fill
- Side: Left
- Serial results:
- Residual norm converges to 4.??·10^-13^ after 5 iterations
- Drag coefficient: CD = .53 counts
- Lift coefficient: CL = .96 counts
- Parallel results:
- Residual norm converges to 4.3545·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
Newton-UMFPACK
- Nonlinear solver:
- Newton
- Preconditioner:
- Threshold-based Incomplete LU
- Side: Right
- Reordering type: Minimum discarded fill
- Serial results:
- Residual norm converges to 4.3559·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
- Parallel results:
- Residual norm converges to 4.3506·10^-13^ after 5 iterations
- Drag coefficient: CD = .5318 counts
- Lift coefficient: CL = .9638 counts
Lean Jacobi
- Nonlinear solver:
- Lean Jacobi
- Preconditioner:
- None
- Serial results:
- Residual norm converges to 4.7345·10^-4^ after 200 iterations
- Drag coefficient: CD = .5098 counts
- Lift coefficient: CL = .9478 counts
- Parallel results:
- Residual norm converges to 4.7345·10^-4^ after 200 iterations
- Drag coefficient: CD = .5098 counts
- Lift coefficient: CL = .9478 counts