Abstract
This study focuses on the numerical study of flow structure analysis around bluff bodies close to the downstream face of the free-channel surface. This was investigated using coefficient pressure, coefficient drag, lift coefficient and skin friction coefficient on high Reynolds number (ReH = 2.19 × 106). The general procedure for this research is formulated in detail for allocations in dynamic analysis of fluid computing. The numerical model used is the 2D RANS model (Steady Reynolds Averaged Navier Stokes) with the standard k-ɛ model by giving a flow rate of 40 m / s. This bluff body model will be given the addition of diffuser treatment on the back where the result will be compared to the model without the addition of diffuser and the addition of round shape on the top front on both models. From the research it was found that the coefficient drag bluff body with the addition of diffuser is bigger than the bluff body without the diffuser, it can be concluded that the diffuser angle used is too big causing the coefficient drag to become bigger.
Highlights
Many research has been done to determine the fluid flow characteristics in crossing a bluff body. It is done for the sake of academic as well as to examine various forms of construction related to the technical application
The diffuser is one of the most important aerodynamic devices often found on F1
The diffuser has been widely used in ordinary cars
Summary
Many research has been done to determine the fluid flow characteristics in crossing a bluff body. It is done for the sake of academic as well as to examine various forms of construction related to the technical application. The researchers tried to compare the fluid flow characteristics in bluff body given additional diffuser and without the diffuser. Lee investigated numerically the highgap effect of the ground by using unsteady wake flow fields on the bluff body model area close to the ground. He reported that the vortex was started to explain the interaction.
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