Abstract
An improved synthetic eddy method (SEM) is proposed in this paper for generating the boundary layer at the inlet of a computational domain via direct numerical simulation. The improved SEM modified the definition of the radius and the velocities of the eddies according to the distance of the eddies from the wall in the synthetic region. The regeneration location of the eddies is also redefined. The simulation results show that the improved SEM generates turbulent fluctuations that closely match the DNS results of the experiments. The skin friction coefficient of the improved SEM recovers much faster and has lower dimensionless velocity at the outer of the boundary layer than that of the traditional SEM.
Highlights
The rapid growth of computation ability has had a great impact on the field of computational fluid dynamics (CFD)
Compared with the profile of the radii of the eddies proposed by Jarrin et al [12], the profile proposed in this paper reduces the eddy radii near the wall, while it is closer to that proposed by Mankbadi et al [17]
The turbulence structures introduced at This the inflow is followed by an increase in turbulence as the turbulent boundary layer tends toward boundary are adjusted to some degree, causing the turbulence to initially decay
Summary
The rapid growth of computation ability has had a great impact on the field of computational fluid dynamics (CFD). Different similarity laws are used to rescale the mean velocity and fluctuations in the inner and outer regions of the boundary layer [6]. This method has a good application in the calculation of straight flow fields [7,8,9], but it is difficult to calculate the flow field with complex configurations. Several practical problems are found in our application of SEM: The traditional SEM seems to overestimate the eddy radii in the near wall region. The velocity of vortex structures in the near wall region of the turbulent boundary layer.
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