Analysis of Secondary Flow Induced by a 90 Bend in a Pipe Using Mode Decomposition Techniques
2013 (English)Conference paper (Refereed)
In this study unsteady simulations of the flow through and after a 90 pipe bend has been performed by Large Eddy Simulations (LES). In the passenger car engine there is an abundance of pipes and pipe bends. Since pipes and bends are often situated upstream of important engine components the flow in these needs to be well predicted. This entails that there is a need for accurate pipe flow simulations in order to ensure that the inflow conditions, to the e.g. cylinders or turbocharger, are as close to the experimental values as possible. The flow field is further studied by the use of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). It has been found that there is a low frequency oscillation in the strength of the alternately dominant dean vortex at the exit of the pipe bend. This phenomenon is analysed and the mechanism for it is discussed.
Place, publisher, year, edition, pages
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-151397OAI: oai:DiVA.org:kth-151397DiVA: diva2:748453
4th International Conference on Jets, Wakes and Separated Flows, ICJWSF2013
QC 201409192014-09-192014-09-192014-09-19Bibliographically approved