Abstract
To develop a large-eddy simulation (LES) method for non-Newtonian viscous fluid such as surfactant solution, we performed direct numerical simulations (DNS) of turbulent channel flow, and investigated features of wall turbulence of non-Newtonian viscous fluid. As a result, we could identify modulations of the wall turbulence from that of Newtonian fluid. Furthermore, scale analyses from viewpoints of instantaneous structures and turbulence statistics revealed that the turbulent structures of non-Newtonian viscous fluid could be generally normalized with the local variable viscosity as well as the case of Newtonian fluid. According to the results of the DNS, we suggested a modified model for LES and validated the reliability for turbulent flow of surfactant solution.
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