State Key Laboratory for Geomechanics and Deep Underground Engineering;
China University of Mining and Technology;
Xuzhou;
221116;
China;
School of Engineering;
Nagasaki University;
Nagasaki;
852-8521;
Japan;
School of Petroleum Engineering;
China University of Petroleum;
Qingdao;
266580;
China;
Double-rough-walled; fracture; Navier-Stokes(NS)equations; Anisotropy; Fractal; dimension;