This paper studies the steady streaming flow of low Reynolds number between two eccentric circular cylinders.

1, the flow about an oscillating circular cylinder at Re = 100 was studied in this paper.

Aiming at the problem of flow around oscillating cylinder concerned in engineering, a circular cylinder oscillating transversely in a uniform stream is simulated by solving the N-S equations with SIMPLE algorithm in the system of colocated grids and dynamic mesh simulating moving boundary of the cylinder.

Numerical simulation of oscillating cylinder in water at rest is done by RANS equation and dynamic mesh method.

It is introduced briefly the modification way and result of lignosulphonate(LS) as coal-water slurry(CWS) additive and determination of the adsorption film thicknesses of the LS and modified lignosulphonate(MLS) on the smooth surface of coal and microscopic slide by the method of elliptical polarization.

By discussing the problem of superposition of two linear polarized beams which are of the same frequency,of random vibrating directions and of the constant phase difference,the general expression of the coherent conditions and elliptical polarization is obtained.