Numeric Study on Skin Friction Reduction of Engine Oil-WS2 Nanofluid by MRT Lattice Boltzman Method

New lubricants use nanoparticles like WS2 to improve lubrication performance.The aim of the present study is to determine numerically the skin friction of nanofluid on moving surfaces in a lubricating system.The base fluid is 5W-30 engine oil and the nano-additive is WS2 nanoparticles.This numerical study is based on the multiple-relaxation-time Lattice Boltzmann method(MRT-LBM).The two-dimensional nine-velocity(D2Q9)model is adopted to simulate the nanofluid flow confined by two moving surfaces.The parameters considered are the nanoparticle concentration􀟮and the flow Reynolds number Re.The results obtained show a reduction of skin friction factor when we increase the nanoparticle concentration.