@phdthesis{Meiselbach2015, author = {Meiselbach, Falko T.}, title = {Application of ODT to turbulent flow problems}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-34952}, school = {BTU Cottbus - Senftenberg}, year = {2015}, abstract = {The continual optimization process for more efficiency of industrial flows has raised the need for providing deeper understanding of turbulence. These details can be provided by direct numerical simulation (DNS), which is impossible for most flows with current computers. Therefore, progress in optimizing Reynolds averaged Navier-Stokes (RANS) and large eddy simulation (LES) modeling strategies will need to continue. Another ansatz is the reduction to 2D or 1D models to reduce the numerical cost. One dimensional turbulence (ODT) as presented by A. R. Kerstein is a new modeling strategy that reduces the 3D simulation to a 1D line of sight through the flow region. Due to the higher resolution afforded by the 1D model, it is possible to simulate even the smallest scales and to provide insight into turbulence statistics. To assess the advantages and disadvantages of the model, ODT has to be validated against several flows. Within this thesis, ODT is validated against the channel flow, the passive scalar transport and the channel flow with a fluctuating pressure gradient. These flows are simplified test cases for the phenomena present in single-phase industrial flows. ODT produces meaningful results for friction Reynolds numbers up to Reτ = 6·10⁵ and for Prandtl numbers from Pr = 0.025 to 50. Statistics of the wall shear stress are presented and the influence of pressure fluctuations is discussed. Based on these channel results, the non-breaking and breaking jet are simulated. While the former is a simplified case of a free-surface flow, the latter is of primary interest for spray formation and fuel injection. Detailed statistics of the TKE budgets and the breakup are presented. As the last case, the cloud top of a stratocumulus-topped boundary layer (STBL) was simulated. The case combines the interaction of an active and a passive scalar. It further combines the simulation of a stable and an unstable stratified region that suppresses and enhances turbulence respectively. The simulations reproduce the entrainment velocity and generate comparable mean and flux profiles compared to DNSs.}, subject = {One-Dimensional Turbulence; ODT; Channel flow; Heat transfer; Smoke cloud; One-Dimensional Turbulence; ODT; Kanalstr{\"o}mung; W{\"a}rme{\"u}bertragung; Rauchwolke; Turbulente Str{\"o}mung; Numerische Str{\"o}mungssimulation}, language = {en} }