ABSTRACT
The problem about calculation of 3-dimensional fields of the velocity and of the pollution concentration in turbulent flow in the straight channels with complex cross-section is solved. The mathematical model, which allows to calculate the secondary flows (vortexs with longitudinal axis), which influence greatly on the dynamic of the flow and on the mass transport processs is used. The calculation results are compared with experiments and are in qualitative agreement. The recomendation about method of pollution effluent which leads to more rapidly pollution delution are given.
