  Under investigation is a generalized (3 + 1)-dimensional B-type
Kadomtsev-Petviashvili equation with variable coefficients in fluid dynamics.
Based on the Hirota's bilinear form and the positive quadratic function,
abundant lump solutions are obtained.The interaction solutions between lump
solutions and other solitons are also presented. Their dynamical behaviors are
graphically shown with different choices of the free parameters.
