Numerical Simulation Of Mold Electromagnetic Stirring In Continuous Casting Of Square Billet

When electromagnetic stirring technology is applied to continuous castingproduction,it can expand equiaxial crystal area,reduce center loose, segregation andshrinkage,greatly reduce casting surface and subcutaneous inclusion,porosity and otherdefects.The advantages attraced researchers carrying out lots of research work. Theessence of the electromagnetic stirring is that coil passing into low-frequency alternatingcurrent can produce the changing magnetic field. The changing magnetic field cangenerate induced current in the liquid steel. The interaction between induced current andmagnetic field produces Lorenz force in the liquid steel to drive liquid steel flow.Physicalsimulation of its theoretical analysis is difficult, numerical simulation has been aeffective mean to study electromagnetic stirring technology in the process of continuouscasting.The numerical simulation method became an effective and relatively simplemethod to determine electromagnetic stirring structure and process parameter.Taking a mold electromagnetic stirring in a steel plant as a research object,in thispaper,I ignored the influence of the flowing liquid steel on the electromagnetic field. Onthe basis of Maxwell's equation set,I established electromagnetic flied mathematicalmodel.Then,I confirmed the steel flow state as turbulence,chose low Reynolds model asliquid steel flow model,and established flow flied mathematical model on the basis ofcontinuous equation, momentum equations and Navier-Stokes equations.By finiteelement software ANSYS,I carried out2d and3d numerical stimulation forelectromagnetic flied and flow flied,as well as analyzed its distribution and changingrule. I investigated the influence of current strength and current frequency on magneticinduction and electromagnetic force.Using physical environmental law in the coupledanalysis,I applied electromagnetic force to flow field analysis as volume force,thencoupled flow field with electromagnetic field so that I got its distribution and deteminnethe technical parameters.