One-way fluid structure interaction of pipe under flow with different boundary conditions

Abstract

This  paper  deals  with  the  analytical  modelisation and  the  numerical  simulation  of  fluid  structure  interaction (FSI)  phenomena  of  pipeline.  The  equations  of  motions and  equilibrium  are  coupled  together  taking  into  account the  influence  of  the  fluid  flow  inside  the  pipe.  The  fluid circulating  in  the  pipe  has  the  flexional  motion  as  that  of structure.  The  analytical  model  is  based  on  the  Newtonian approach.    The  practicability  of  the  calculation  model  and the  effects  of  fluid-structure  interaction  are  illustrated  by calculations  for  some    simple    systems,    for      pipe  with boundary  condition    pinned-pinned.  Independently  of  the analytical  method,  a  numerical  modal  analysis  is  realized   in  the  fluid  structure  configuration.  This  configuration  has   been  simulated  by  coupling  the  two  commercial  solvers: Fluent  code  of  fluid  mechanical  (CFD,  Computational Fluid  Dynamics),  and  ANSYS  classical  code  of  structure mechanical  (CSD,  Computational  structure  Dynamics)  for pipes  with  different  boundary  conditions:  pinned-pinned, clamped-pinned  and  clamped-clamped.  We  describe  the technique  used  to  solve  the  equations  associated  in  the determination  of  natural  frequencies.  For  this,  we  use  code ANSYS  Workbench  where  the  equations  are  discritized with  finite  element  method.  The  results  obtained numerically  are  similar  to  those  obtained  by  the  analytical approach.

DOI: http://dx.doi.org/10.5755/j01.mech.22.6.13189