dirichlet

Inherits from: condlim_base

Dirichlet condition at the boundary called bord (edge) : 1). For Navier-Stokes equations, velocity imposed at the boundary; 2). For scalar transport equation, scalar imposed at the boundary.

frontiere_ouverte_concentration_imposee

Inherits from: dirichlet

Imposed concentration condition at an open boundary called bord (edge) (situation corresponding to a fluid inlet). This condition must be associated with an imposed inlet velocity condition.

Parameters:

ch (type: front_field_base) Boundary field type.

paroi_defilante

Inherits from: dirichlet

Keyword to designate a condition where tangential velocity is imposed on the wall called bord (edge). If the velocity components set by the user is not tangential, projection is used.

Parameters:

ch (type: front_field_base) Boundary field type.

paroi_deplacement_impose

Inherits from: dirichlet

CL_Deplacement_Impose/paroi_deplacement_impose

Parameters:

ch (type: front_field_base) Boundary field type.

paroi_knudsen_non_negligeable

Inherits from: dirichlet

Boundary condition for number of Knudsen (Kn) above 0.001 where slip-flow condition appears: the velocity near the wall depends on the shear stress : Kn=l/L with l is the mean-free-path of the molecules and L a characteristic length scale.

U(y=0)-Uwall=k(dU/dY)

Where k is a coefficient given by several laws:

Mawxell : k=(2-s)*l/s

Bestok&Karniadakis :k=(2-s)/s*L*Kn/(1+Kn)

Xue&Fan :k=(2-s)/s*L*tanh(Kn)

s is a value between 0 and 2 named accomodation coefficient. s=1 seems a good value.

Warning : The keyword is available for VDF calculation only for the moment.

Parameters:

name_champ_1 (type: string into ['vitesse_paroi', 'k']) Field name.
champ_1 (type: front_field_base) Boundary field type.
name_champ_2 (type: string into ['vitesse_paroi', 'k']) Field name.
champ_2 (type: front_field_base) Boundary field type.

scalaire_impose_paroi

Inherits from: dirichlet

Imposed temperature condition at the wall called bord (edge).

Parameters:

ch (type: front_field_base) Boundary field type.