/UPWM/TG (Obsolete)

Engine Keyword Describes the Taylor Galerkin method for momentum advection. This method is not available with multi-material LAW51 (/MAT/MULTIMAT).

Format

/UPWM/TG

fac

Definitions

Field Content SI Unit Example
fac Coefficient for upwind term. 3

Default = 1.00

  

Comments

  1. A Taylor development is applied on velocity vector and substituted in Navier Stokes equations. Integration is performed using standard Bubnov Galerkin integration. This introduces terms with a streamline character. Assumption is made that viscous stress is negligible (high Reynolds number). This is also not valid for stationary cases.
  2. If this keyword is used, the usual upwind method for momentum advection (defined with coefficient η 1 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeq4TdG2aaS baaSqaaiaaikdaaeqaaaaa@388A@ from /UPWIND (Obsolete)) is replaced.
  3. Best results are obtained for:(1)
    fac = max   ( 1 , 1 M )

    Where, M is the Mach number. Which means for subsonic simulation, coefficient fac > 1 is advised. The original TG method is obtained for fac = 1.00 and does not take into account compressibility for stability time step (upwind term is proportional to it).

  4. The /SUPG and /TG options are available in 3D Euler, 3D ALE and 2D Euler, although they are not recommended in axisymmetric cases.