Numerical Simulation Of Taylor-Couette Flow Under Transverse Magnetic Field

The MHD Taylor-Couette flow has unique motion characteristics,which can effectively control the Taylor vortex through the change of the external mag netic field,so that the flow field presents a colorful state of motion.In industrial production,the application of a magnetic field can control the growth process of crystals.The movement of the melt under the action of the magnetic field has many similarities with the MHD Taylor-Couette.Therefore,the evolution process of Taylor-Couette flow field under the action of magnetic field is analyzed to understand its motion law,which has good academic and engineering application value.In this paper,the numerical simulation of Taylor-Couette flow under transverse magnetic field was carried out by using ANSYS Fluent computational fluid dynamics commercial software.The influences of parameters such as cylinder rotation strength,magnetic field strength and magnetic field loading position on flow characteristics were investigated.The evolution process,statistical mean velocity distribution and turbulent kinetic energy intensity distribution of Taylor vortex under magnetic field are analyzed,and compared with the flow condition under axial magnetic field.The study found that when the local magnetic field is loaded,Couette flow is formed in the flow field when the Reynolds number is small,the Taylor vortex is suppressed and reduced,and finally disappears;The Taylor vortex outside the magnetic field gradually increases until it fills the entire watershed.When the Reynolds number is large,a Taylor-Couette turbulent flow is formed,and the local magnetic field has a certain inhibitory effect on the Taylor vortex in the acting area,but has little effect on the Taylor vortex in other areas.When the global magnetic field is loaded,a non-axisymmetric flow pattern is generated in the Couette laminar flow field.With the increase of the magnetic field strength,the Taylor vortex moves from the outside to the inside of the ring and shows a flattening trend.At the same time,the size of the Taylor vortex becomes smaller,the number of Taylor vortex increases,and eventually rupture.When the flow is Taylor-Couette turbulence,the Taylor vortex breaks into small-scale vortex structures,which is arranged along the direction of the magnetic field.In different areas of the flow field,the flow presents different characteristics.Compared with the axial magnetic fi eld,the transverse magnetic field has a weaker suppression effect,and the flow field distribution shows obvious anisotropy.