|Type of mesh
||2D and 3D
The translator creates the input files for the Rolls-Royce PRECISE CFD code :
The translator writes the PRECISE files from a multiblock
structured mesh, a boundary conditions file and parameters file
PRECISE input file , containing only the keyword 'read_bc'
grid.d: PRECISE grid file in
Plot3D multiblock format
zone.d: PRECISE file containing
internal blocking information
precise.log: .log file containing translator information
Generating the mesh
The grid must be written out as a multiblock mesh.
Note for meshes with rotational periodicity : Periodic meshes for
PRECISE need the axis of rotation at (1.,0.,0.).
The interface supports SI and Imperial units. Please select the solver with the
approriate unit system:
"Select solver" → PRECISE(SI)
"Select solver" → PRECISE(imperial)
Setting the PRECISE Parameters and Options
Click on "Edit parameters" which brings up the Solver parameter window. Within
this menu solver parameters and options are specified, such as title, scaling
factor, solution type parameters and liquid spray definition.
Within the 'solution type' panel, parameters are
specified, such as turbulence model, density model, refererence temperature
etc. The user can also define in this panel if he perfers to specify the exit
and inflow massflow as absolut value or as proportion.
To define liquid spray size groups select the '+' next to "Number of Spray Size
Groups" in the left-hand column. New Liquid Fuel Spray Definitions can be
created by selecting "Create new" under the " Liquid Fuel Spray Definition"
Once the desired parameters and properties are specified select "Accept" at the
bottom of the "Solver parameters" panel. This writes the
parameter file (.par) to be used in the translation process. This is
the minimum that needs to be performed to enable the PRECISE files to be
Setting Boundary Conditions
To set boundary conditions select "Boundary conds" from the Output menu.
For the families under Volumes the zone can be specified as fluid
(default) or solid.
For the families under Surfaces the flow features can be
specified, such as:
Non-Swirling Flow (Simple Definition) :
Swirling Flow (Simple Definition) :
Non-Swirling Flow (Comprehensive Definition) :
Swirling Flow (Comprehensive Definition) :
Creating the PRECISE Files
After clicking "Write input" you can specify options for the PRECISE
Select "Done" to perform the translation.
specify if grid file is to be written in ASCII or Binary
give the name of the topology file
give the name of the boundary condition file
give the name of the parameter file
specify directory for the precise file to be written
The translator generates the Precise files in the Precise problem directory.
This interface is only written for 3D and 2D multiblock meshes.
For 2D (planar and axissymetric) the grid must be defined in the i-j index
plane (x-y physical plane).