I am looking for simple benchmark problems to evaluate my two-phase flow code. Can anyone help me to find simple problems of two phase flow (e.g. oil and water) which have analytical solutions?

M. Sukop introduce’s the Laplace law in his book, a law which relates the radius of a droplet to the pressure difference between the inside and the outside of the droplet. Although it is just a simple law, it can be useful for benchmarking purposes.