sunfluidh:wall_boundary_conditions_examples
Rules of construction
Click here to come back to the "Heat_Wall_Boundary_Condition_Setup"
Click here to come back to the "Velocity_Wall_Boundary_Condition_Setup"
Click here to come back to the "Species_Wall_Boundary_Condition_Setup"
Click here to come back to the "Polyhedral_Immersed_Bodies"
Click here to come back to the "Cylindrical_Immersed_Bodies"
The user finds here the elements in order to understand how to build the wall boundary conditions.
The wall boundary conditions are defined with different types of namelists :
- The namelists describing the type of wall boundary conditions applied to different physical quantities (temperature,velocity, species). This group of namelist is here named the “Wall Boundary Condition Type” (WBCT) :
- The enthalpy or temperature : Namelist "Heat_Wall_Boundary_Condition_Setup"
- The velocity components : Namelist "Velocity_Wall_Boundary_Condition_Setup"
- The species mass fractions : Namelist "Species_Wall_Boundary_Condition_Setup"
- The namelists defining the positions of walls that belong to the immersed bodies. Such a namelist is here named an “Immersed body descriptor” (IBD) :
The following points are really important to understand how to construct the wall boundary conditions.
- A full set of wall boundary conditions (“WBCT”) is created when the namelists related to the heat, velocity or species have got the same name, namely when the common variable 'Wall_BC_DataSetName' is set with the same character string (see examples below).
- Each immersed body (IBD) has to be linked to one of the WBCT defined in the data file. The link is made by means of the variable 'Wall_BC_DataSetName' belonging here to the namelists "Polyhedral_Immersed_Bodies" or "Cylindrical_Immersed_Bodies". This variable must match with these ones of the namelists "Heat_Wall_Boundary_Condition_Setup", "Velocity_Wall_Boundary_Condition_Setup" or "Species_Wall_Boundary_Condition_Setup".
- The walls placed at the ends of the domain are always linked to the WBCT whom Wall_BC_DataSetName= “Set1”.
- Differents IBD can be linked to the same WBCT in order to prevent any redundant WBCT in the data file.
- The explicit setting of a namelist can be omitted if the physical quantity is not required in the simulation. For example :
- For any case without multi-species fluids, the namelist "Species_Wall_Boundary_Condition_Setup" can be omitted.
- For any case without thermal transfer, the namelist "Heat_Wall_Boundary_Condition_Setup" can be omitted.
- If an usual boundary condition are used for all the walls of the geometrical configuration, the associated namelist can be removed. For example :
- For adiabatic walls the namelist "Heat_Wall_Boundary_Condition_Setup" can be removed.
- For no-slip and impermeability conditions, the namelist "Velocity_Wall_Boundary_Condition_Setup" can be removed.
- For no wall effect on species (zero gradient condition), "Species_Wall_Boundary_Condition_Setup" can be removed.
Examples of wall boundary conditions
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sunfluidh/wall_boundary_conditions_examples.txt · Dernière modification : 2020/01/30 10:54 de yann