fluid [-f filename] [-m mu] [-r rho]
-m 1.0 -r 1.0
fluid specifies the physical fluid parameters of the calculation. fluid interprets the following options.
- -f filename - Initial fluid velocities stored in filename.
- -m mu - Fluid viscosity
- -r rho - Fluid density
FLUID VELOCITY FILE
If the option -f filename is used, then the fluid velocities are assumed to be stored in a file. This file must contain nx*ny lines and each line must contain two numbers corresponding to the components of the fluid velocity at a given point. The data will be read with the following FORTRAN code, so setup the file accordingly.open (10, file=filename, status='old') do j = 1, ny do i = 1, nx read(10,*) u(i,j,1), u(i,j,2) enddo enddo close (10)
Notice that the code reads the u component first, then the v component of the velocity field, and it reads along a complete row before the column is changed.
fluid -m 0.6 -r 1.0
The viscosity of the fluid is 0.6 and the density of the fluid is 1.