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Flui d- St ructure Interaction for Com bustion Systems Artur Pozarlik Jim Kok

FLUISTCOM QUB, BELFAST, 24 JANUARY 2007. Flui d- St ructure Interaction for Com bustion Systems Artur Pozarlik Jim Kok. Work performed during last 6 months. One-way fluid-structure interaction from fluid to structure with the use of CFX and Ansys (dynamic analysis)

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Flui d- St ructure Interaction for Com bustion Systems Artur Pozarlik Jim Kok

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  1. FLUISTCOM QUB, BELFAST, 24 JANUARY 2007 Fluid-Structure Interaction for Combustion SystemsArtur PozarlikJim Kok 1

  2. Work performed during last 6 months • One-way fluid-structure interaction from fluid to structure with the use of CFX and Ansys (dynamic analysis) • Two-way fluid-structure interaction • Backward Facing Step with heat transfer, case with pulsating flow and oscillating wall (short and long duct) • One-way interaction for DESIRE setup configuration, comparison CFX and Ansys results with experimental data 2

  3. BFS Transient heat transfer and oscillated velocity u y x q 3

  4. BFS Transient heat transfer and oscillated velocity Significant deviation in skin friction coefficient for the lowest frequency Deviations in Stanton number for the lowest frequency 4

  5. BFS Transient heat transfer and oscillated velocity 5

  6. BFS Transient heat transfer and oscillated velocity 6

  7. BFS Transient heat transfer and moving wall • Pulsation: • sin • amplitude 0.002 m • frequency 10 Hz • SST y x Y q • Thesame configuration of the backward facing channel as in the steady state case • The same number of elements and boundary conditions • Time step equals to 5 ms • Expansion ratio variations between 1.24 – 1.26 7

  8. BFS Transient heat transfer and moving walls 8

  9. BFS Transient heat transfer and moving walls 9

  10. BFS with heat transfer – new geometry y x q Y 10

  11. BFS with heat transfer – new geometry 11

  12. BFS with heat transfer – Pressure profiles 12

  13. BFS with heat transfer – Intensity profiles 13

  14. One- and two-way interaction One – way interaction is a sequential process of the fluid and the solid physics coupling. The surface pressure and the shear from the flow in the combustion chamber were computed by using CFX CFD simulation and further are transferred to the mechanical analysis in the Ansys code. The stress and deformation of the flexible walls are predicted. Fig.18. Implementing results from CFX to Ansys CFX Mechanical loads Deformations Time step ANSYS Fig. 19. Information exchange between solvers Two – way interaction is a sequential or simultaneously combined of the fluid and solid physics analysis. In opposite to one – way interaction both codes: Ansys and CFX serve and receive information from numerical calculation. 14

  15. One- and two-way interaction Fig. 20. CFX results (top) and boundary conditions for structure calculations (bottom) 15

  16. One- and two-way interaction /15.4/ 16

  17. One- and two-way interaction /15.4/ 17

  18. One-way interaction – DESIRE configuration /15.7/ 18

  19. One-way interaction – DESIRE configuration /15.7/ E nc 19

  20. Conclusions • Excitation with 10 Hz frequency affected significantly mean Stanton number and skin friction coefficient profiles, as a results of breaking up recirculation region • Significant influence of pulsating flow was observed on the instantaneous flow properties. • Variations in wall position influence the instantaneous values of heat transfer and wall shear stress but mean profile was not changed significantly • Both, one- and two-way interactions, predicted similar wall deformation • The moving wall works as the source of acoustic field • Synchronized modes are the effective source • Good agreement of the velocity magnitude predicted by numerical calculation with experimental results 20

  21. Future work • Experimental work at test rig • One-way dynamical analysis • Model of the wall as a source of sound 21

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