I have two questions regarding the force term in RayleighTaylorXd examples, and highly appreciate it if you could help me out.
In RayleighTaylor2d example, the equation used for the force term is expressed by:
T force = 30./( T )ny/( T )ny;
and in RayleighTaylor3d example:
T force = 7./( T )ny/( T )ny;
1) I absolutely understand that the force field on lattice 1; however, I cannot find the logic behind using such an equation to include the gravity to the system, especially the reason for using those numbers in numerator (30 in RayleighTaylor2d and 7 in RayleighTaylor3d)! Could you please let me know how this equation has been derived? What’s the logic behind it?
2) What is the dimension of the force term here? Is it in fact the force per unit area?
Many thanks in advance for your response,
Mehrdad Vasheghani Farahani