sunfluidh:inlet_outlet_boundary_conditions_examples

### Table des matières

## Example of inflow/outflow boundary conditions

Click here for the previous page on the inlet boundary conditions

Click here for the previous page on the outlet boundary conditions

- This example is defined for a 2D geometrical configuration. The size of the domain is $1.5 \times 1.0.$
- The flow is homogeneous (no multi-species gas)
- An inlet is located at the down left side of the domain (red line on the figure).
- An outlet is located at the top right side of the domain (green line on the figure).
- Conditions are constant in time

(inlet in red line, outlet in green line, remaining walls in blue lines)

## Inflow data

### Example 1

- 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 , End_of_Data_Block= .true. /

### Example 2

**Not for the release SUNFLUIDH_EDU**

- The flow is homogeneous (no multi-species gas)
- The temperature and the density are constant.
- The normal velocity component is time-dependent :
- The function is sinusoidal. The mean value of the time function is given by “Normal_Velocity_Reference_Value”.
- the frequency is 10 Hz
- The magnitude is 40% of the mean inlet velocity

&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 , Time_Fct_Name= "Sinus" , Time_Fct_Threshold= 0.0 , Time_Fct_Time_Scale= 0.1 , Time_Fct_Magnitude= 0.4 , End_of_Data_Block= .true. /

## Outflow data

### Example 1

- 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 , End_of_Data_Block= .true. /

### Example 2

** Not for the release SUNFLUIDH_EDU**

- The outflow is based on pressure conditions.
- The (dynamic) pressure value is given by “Pressure_Reference_Value”. It is imposed out of the domain and located at a distance “Length_Scale” from the outflow plan (Robin condition).
- Keep in mind that the pressure is here related to the dynamics, not to the thermodynamics of the flow. It is therefore defined from a reference value which can be null.

&Outlet_Boundary_Conditions

Type_of_BC= "FREEBC", 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 , Pressure_Reference_Value = 0.0 , Length_Scale= 0.2 , End_of_Data_Block= .true. /

Click here for the previous page on the inlet boundary conditions

Click here for the previous page on the outlet boundary conditions

Traductions de cette page:

sunfluidh/inlet_outlet_boundary_conditions_examples.txt · Dernière modification : 2018/12/15 14:56 de yann