/UPWIND (Obsolete)

Engine Keyword Enables you to modify coefficients for standard upwind formulation previously defined from Starter Input or from previous run.

Format

/UPWIND

$η$ ₁ $η$ ₂ $η$ ₃

Field	Content	SI Unit Example
$η$ ₁	Upwind coefficient on ALE momentum transport 2 Default = 1.0 (Real) 0 ≤ $η$ ₁ ≤ 1 (full upwind)
$η$ ₂	Upwind coefficient on other ALE transports (mass, energy ...) Default = 1.0 (Real) 0 ≤ $η$ ₂ ≤ 1 (full upwind)
$η$ ₃	Upwind coefficient for wet area 3 Default = 1.0 (Real) 0 ≤ $η$ ₃ ≤ 1

Field

Content

SI Unit Example

η

₁

Upwind coefficient on ALE momentum transport 2

Default = 1.0 (Real)

0 ≤ $η$ ₁ ≤ 1 (full upwind)

η

₂

Upwind coefficient on other ALE transports (mass, energy ...)

Default = 1.0 (Real)

0 ≤ $η$ ₂ ≤ 1 (full upwind)

η

₃

Upwind coefficient for wet area 3

Default = 1.0 (Real)

0 ≤ $η$ ₃ ≤ 1

This option can be used with ALE or Eulerian modeling.
This $η_{2}$ coefficient has no influence if Taylor Galerkine (/UPWM/TG (Obsolete)) or Streamline Upwind (/UPWM/SUPG (Obsolete)) formulation is defined, except for multi-material LAW51 (/MAT/LAW51 (MULTIMAT)).
$η_{3}$ is a coefficient for multi-phase law. $η_{3}$ is only available for multi-material LAW51 (/MAT/MULTIMAT).
$η_{3}$ =1 is stable, but diffusive.

$η_{3}$ =0 is less diffusive, but might be unstable.