Study On Hydrodynamic Of KGM Aerogel Cylinder Based On FLOW-3D

In recent years,marine oil pollution accidents occur frequently with the prosperous development of offshore oil exploration and exploitation and marine transportation industries,which greatly threatened the survival,growth and reproduction of marine life,which would affect the quality and safety of seafood,moreover endanger human health and safety accordingly.How to improve the efficiency of repairing marine oil pollution emergency is an urgent problem in the field of today's marine environment and food safety field.Konjac glucomannan(KGM)aerogel cylinder,a new integrated bioremediation combined with physical adsorption,biological emulsification and biological degradation,is a bacteria-microalgae bioremediation system immobilized by KGM aerogel.It could be constructed to study the possibility of remediation mechanism on marine residual oil pollution.So the study of hydrodynamic performance of KGM aerogel cylinder becomes very meaningful.This paper based on FLOW-3D,using the method of wave speed entrance to make wave and change space step method to absorption,successfully built a two-dimension(2-D)and three-dimension(3-D)numerical wave basin.And the renormalized group model(RNG ?-?)was used,with the finite difference method and volume of fluid method(VOF)to solve the Navier-Stokes(N-S)equation,analyzing the surface,instantaneous velocity magnitude and pressure under the simulative interaction of KGM aerogel cylinder and turbulence.This study also focused on the normal displacement and Von mises stress of the KGM aerogel cylinder via fluid-structure interaction(FSI)simulation,which would help analyze the relationship between the stress distribution and the flow field parameters,providing a theoretical basis for the design and application of KGM aerogel cylinder.The results obtained from this study were as followed:(1)A stable wave field was established through the boundary wave method and changing space step method,(2)FLOW-3D software could simulate the changing free surface of different time during wave propagation.(3)The simulation figure of velocity magnitude was obtained.In the process of wave moving,the velocity vector around the cylinder rendered 3-d features.Through x-z,x-y views,the velocity vector direction and size variation of different time during the waves spread could be observed.(4)Pressure graph showed that on the X axis direction and Z axis direction pressure changed significantly.Pressure acting on cylinder in X axis direction was on a maximum of 2780N,in Y axis direction was on a maximum of 440 N,in Z axis direction was on a maximum of 5000N.(5)The mean iso stress on the the middle part of the cylinder was largest.The peak of Von mises stress was showed in two points on the middle part of the cylinder.The maximum of Von mises stress ranged from 3555 Pa to 66453 Pa,according to the Von mises yield criterion,in this experiment,the cylinder was stable.(6)Under the action of FSI,displacement occurred in multiple directions,and the largest displacement was 0.007 m on X axis direction.Therefore,in the process of design and application of KGM aerogel cylinder,the situation stress concentrating on the middle part of the cylinder should be avoided.