Chapter 60: Deformable Baffle in a Duct using OpenFSI

60

Deformable Baffle in a Duct using OpenFSI

Summary Introduction Results

1164 1165

1165 1166

Input File(s) Video 1166

1164 MD Demonstration ProblemsCHAPTER 60

SummaryTitle OpenFSI Features GeometryFlow

Chapter 60: Deformable Baffle in a Duct using OpenFSI Transient FSI simulation using one of the available OpenFSI CFD partner services

Plate (1x 0.1 x 0.02 m)

Click on image above to play animation Material Properties Analysis Type Boundary Condition Element Type FE Results E = 2.3e+9 Pa, = 0.33, = 1000 Kg/m3 Nonlinear Transient Plate fix at bottom of channel, variable pressure due to fluid loads 3D Brick

References

www.acusim.com/papers/OpenFSI_overview.pdf MD Nastran 2010 Release Guide

CHAPTER 60 1165 Deformable Baffle in a Duct using OpenFSI

IntroductionThis example illustrates setting up a transient FSI simulation using one of the available OpenFSI CFD partner services (OpenFSI-AcuSolve service from Acusim here). MD Nastran calculates the baffle deformation and nodal velocities while the CFD code calculates the flow induced loads on the baffle wetted surfaces. The initial condition is a converged CFD solution on the undeformed baffle. The SOL 400 nonlinear transient solution references the connected OpenFSI service.

Figure 60-1

CFD Geometry of Flexible Baffle in Narrow Duct

ResultsThe flow excites the first natural frequency of the cantilever plate which is 5.28 Hz or a time period of 0.19 seconds that is seen in the tip displacement history in Figure 60-2. Since the plate is elastic with no damping, the damping of the tip oscillation is caused by viscous losses in the fluid flow.

Figure 60-2

Baffle Tip Displacement History

1166 MD Demonstration ProblemsCHAPTER 60

Input File(s)Files plate_baffle_str.dat plate_fsi_baffle.xdb Description MD Nastran input file of flexible baffle xdb produced from the OpenFSI baffle run using Acusolve (20Mb)

openfsi_baffle_cfd_ex AcuSolve input files (attached zip file 15Mb). AcuSolve installation ample.ZIP required. Use the plate_fsi_baffle.xdb results if you don't have access to AcuSolve or would like to skip the MD Nastran OpenFSI run.

VideoClick on the image or caption below to view a streaming video of this problem; it lasts about 10 minutes and explains how the steps are performed.

Figure 60-3

Video of the Above Steps