# Documentation du code de simulation numérique SUNFLUIDH

## Web LIMSI

sunfluidh:border_boundary_examples

## Example of border boundary conditions

• This example is defined for a 2D geometrical configuration. The size of the domain is $1.5 \times 1.0.$
• An inlet is located at the down left side of the domain.
• An outlet is located at the top right side of the domain.
• A symmetrical plan is located at the bottom of the domain (Y=0)

• We remind the user the domain is enclosed by default. Wall boundary conditions are implicitly defined at the ends of the domain.
• The inlet and the outlet are built from the namelists Inlet_Boundary_Condition and Outlet_Boundary_Condition, respectively.
These boundary conditions replace the wall boundary conditions (default) over the areas defined in the namelists.
The inlet and outlets boundary conditions are presented herein for the sake of clarity.
• The border boundary condition in accordance with the described configuration are shown just after the inlet/outlet conditions.

### Inflow data

• The flow is homogeneous (no multi-species gas)
• Conditions are constant in time
 &Inlet_Boundary_Conditions
Type_of_BC= "INLET", Direction_Normal_Plan= 1 ,
Plan_Location_Coordinate= 0.0   ,
Start_Coordinate_of_First_Span = 0.0, End_Coordinate_of_First_Span = 0.5,
Start_Coordinate_of_Second_Span= 0.0  , End_Coordinate_of_Second_Span= 0.0 ,
Flow_Direction= 1 ,
Normal_Velocity_Reference_Value= 1.0  ,
Temperature_Reference_Value= 293.0 ,
Density_Reference_Value=  1.2,
Define_Velocity_profile= 0 /

### Outflow data

• The outflow is based on the mass flowrate conservation.
• The normal pressure gradient is zero (Neumann boundary condition).

&Outlet_Boundary_Conditions

 Type_of_BC= "OUTLET", Direction_Normal_Plan= 1 ,
Plan_Location_Coordinate= 1.5   ,
Start_Coordinate_of_First_Span = 0.5    , End_Coordinate_of_First_Span = 1.0 ,
Start_Coordinate_of_Second_Span= 0.0    , End_Coordinate_of_Second_Span= 0.0 ,
Flow_Direction= 1 /


### Border boundary conditions

• The “BACK” end of the domain must be a symmetric plan.
• The other ends of the domain must be unchanged :
• WEST : Inlet + Wall (by default West_BC_Name= “None”)
• EAST : Outlet + Wall (by default East_BC_Name= “None”)
• FRONT : Wall (the default boundary condition not modified, (by default Front_BC_Name= “None”))
 &Border_Domain_Boundary_Conditions  Back_BC_Name= "Symmetric" /
sunfluidh/border_boundary_examples.txt · Dernière modification: 2018/12/17 09:33 de yann