9.4     Model Input

All the necessary input data for QW-FFM are defined through the *.ff3 file.

The data format is explained below based on examplary *.ff3 file

…\qw_examp\QW_3D\BHM\Heat_FluidFlow\ pp_X_.ff3

! Quick Wave Fluid Flow Modules ver. 1.0

! type of modules 3D

! FFM_VELOCITY_X save every step 50

! FFM_VELOCITY_Y save every step 50

! FFM_VELOCITY_Z save every step 50

! FFM_PRESSURE save every step 50

! number of modules 2

**********************************************

! medium fluid

! volume/limits (xmin,xmax,ymin,ymax,zmin,zmax) -22.715 -11.825 -75. 75. 0. 10.

! inflow/pressure[Pa]/limits 0.5 -22.715 -11.825 -75. -75. 0. 10.

! inflow/temperature[degC] 27

! outflow/pressure[Pa]/limits 0.0 -22.715 -11.825 75 75 0. 10.

! wall/type/limits NOSLIP -22.715 -22.715 -75 75 0. 10.

! wall/type/limits FREESLIP -11.825 -11.825 -75 75 0. 10.

! wall/type/limits FREESLIP -22.715 -11.825 -75 75 0. 0.

! wall/type/limits FREESLIP -22.715 -11.825 -75 75 10. 10.

**********************************************

! medium fluid

! volume/limits (xmin,xmax,ymin,ymax,zmin,zmax) 11.825  22.715 -75. 75. 0. 10.

! inflow/pressure[Pa]/limits 0.5 11.825 22.715 -75. -75. 0. 10.

! inflow/temperature[degC] 27

! outflow/pressure[Pa]/limits 0.0 11.825 22.715 75 75 0. 10.

! wall/type/limits NOSLIP 22.715 22.715 -75 75 0. 10.

! wall/type/limits FREESLIP 11.825 11.825 -75 75 0. 10.

! wall/type/limits FREESLIP 11.825 22.715  -75 75 0. 0.

! wall/type/limits FREESLIP 11.825 22.715 -75 75 10. 10. 

**

Format description:

1.   The first line is a header.

2.   Next line defines type of module:

! type of modules 3D

3D is a default setting. The optional type can be2D – in such case the equations will not consider the Z-dir elements.

3.     The following four lines are not mandatory. If applied, they determine how often (frequency expressed in FFM steps) values of velocities v_x, v_y, v_z and pressure p (FFM_VELOCITY_X, FFM_VELOCITY_Y, FFM_VELOCITY_Z and FFM_PRESSURE) will be saved to volume instantaneous *.vi3 file. The line ended with “0” means no saving of specific variable.

! FFM_VELOCITY_Y save every step 50

4.     The next line indicates number of fluid media (modules) considered in the simulation project.

! number of modules 2

Each fluid module is  then defined in the following lines according to the below description:

a.     The name of the medium

! medium fluid

b.     The box limits of the fluid (boundary coordinates of the area occupied by the medium)

! volume/limits (xmin,xmax,ymin,ymax,zmin,zmax) valxmin valxmax, valymin, valymax, valzmin, valzmax

c.     The pressure and the wall limits of the inflow

! inflow/pressure[Pa]/limits 0.5 -22.715 -11.825 -75. -75. 0. 10.

d.     The temperature of the inflow

! inflow/temperature[degC] 27

e.     The pressure and the wall limits of the outflow

! outflow/pressure[Pa]/limits 0.0 -22.715 -11.825 75 75 0. 10.

f.      The type (boundary conditions) and the limits of the wall

! wall/type/limits NOSLIP -22.715 -22.715 -75 75 0. 10.

The key word of the type can be NOSLIP or FREESLIP, and a illustration of the corresponding velocity behaviour is shown below.