A PANS implementation of k-omega SST turbulence model
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Typ
Examensarbete för masterexamen
Program
Naval architecture and ocean engineering (MPNAV), MSc
Publicerad
2022
Författare
Subramanya, Skanda
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In this thesis, a Partially Averaged Navier Stokes (PANS) turbulence model is implemented
for the standard k-omega Shear Stress model (SST). The source code for the
PANS implementation of the k-omega SST turbulence model was developed using the
C++ programming language. The dynamic PANS turbulence model consists of the
active filter function fk, responsible for the transition from the Reynolds Averaged
Navier Stokes (RANS) region to the Large Eddy Simulation (LES) region provided
with a smoother transition for refined mesh when compared to coarser mesh. The
developed turbulence model was first validated by studying the flow around a cylinder.
After validation, the PANS turbulence model was used to investigate the flow
quantities around BB2 Generic Submarine hull form.
The outcome of this study is that the PANS model simulations predicted the flow
around the circular cylinder better than the k-omega SST model. The validation was
performed for different cylinder grid resolutions for comparison. CFD simulations
were then carried out for the submarine hull model at straight flight and 10-degree
yaw. The PANS model had better flow prediction along the surface of the submarine
when compared to the standard SST model for a straight flight, whereas for the
10-degree yaw, both PANS and SST turbulence model had similar flow predictions.
Beskrivning
Ämne/nyckelord
Partially Averaged Navier Stokes (PANS) , k-omega Shear Stress model (SST) , Turbulence model , C++ programming language , Computational Fluid Dynamics (CFD) , Reynolds Averaged Navier Stokes (RANS) , Large Eddy Simulation (LES)