Numerische Untersuchungen einer Adaptiven Wand am Transsonischen Windkanal Göttingen

Kurzfassung

The subject of this investigation is a simulation of the adaptive wall section of the transonic wind tunnel in Gottingen by computational fluid dynamics. A method for wall adaption of closed tunnel sections for 2D-measurements by Amecke is applied. This investigation uses an existing process chain in the numerical environment of the DLR TAU-code. The measurement series which was examined was taken in the Transonic Wind Tunnel Gottingen at Mach numbers between 0.75 and 0.85. In the process the wall boundary layer of the empty tunnel as well as the pressure distribution of a NACA0010 airfoil had been investigated. The wall adaption method is used iteratively. The results of the simulations at transonic speeds give information about the convergence behavior of the wall adaption which is based on the potential theory. It was observed, that at Mach numbers higher than 0.75 a greater number of adaption steps is required in order to minimize the interference. The measured and calculated pressure distributions show a very good agreement. Fluid phenomena at Mach numbers of 0.85 require the use of a diffusor which was not implemented for the fully subsonic computations. Further investigations show influences due to a gap between the sidewall and the airfoil on the pressure distribution and the adaption. The possibility to perform a numerical simulation of a static experiment in the Transonic Wind Tunnel by taking into account the full geometry of the measuring section could be proven for this procedure.