NDLI: Efficient FEA/CFD Thermal Coupling for Engineering Applications

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Sun, Zixiang John, W. Chew Nicholas, J. Hills Konstantin, N. Volkov Christopher, J. Barnes
Copyright Year	2008
Abstract	An efficient finite element analysis/computational fluid dynamics (FEA/CFD) thermal coupling technique has been developed and demonstrated. The thermal coupling is achieved by an iterative procedure between FEA and CFD calculations. Communication between FEA and CFD calculations ensures continuity of temperature and heat flux. In the procedure, the FEA simulation is treated as unsteady for a given transient cycle. To speed up the thermal coupling, steady CFD calculations are employed, considering that fluid flow time-scales are much shorter than those for the solid heat conduction and therefore the influence of unsteadiness in fluid regions is negligible. To facilitate the thermal coupling, the procedure is designed to allow a set of CFD models to be defined at key time points/intervals in the transient cycle and to be invoked during the coupling process at specified time points. To further enhance computational efficiency, a “frozen flow” or “energy equation only” coupling option was also developed, where only the energy equation is solved while the flow is frozen in CFD simulation during the thermal coupling process for specified time intervals. This option has proven very useful in practice, as the flow is found to be unaffected by the thermal boundary conditions over certain time intervals. The FEA solver employed is an in-house code, and the coupling has been implemented for two different CFD solvers; a commercial code and an in-house code. Test cases include an industrial low pressure (LP) turbine and a high pressure (HP) compressor, with CFD modeling of the LP turbine disc cavity and the HP compressor drive cone cavity flows, respectively. Good agreement of wall temperatures with the industrial rig test data was observed. It is shown that the coupled solutions can be obtained in sufficiently short turn-around times (typically within a week) for use in design.
Sponsorship	International Gas Turbine Institute
Starting Page	1505
Ending Page	1515
Page Count	11
File Format	PDF
ISBN	9780791843147
DOI	10.1115/GT2008-50638
e-ISBN	0791838242
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Cycles Temperature Computational fluid dynamics Fluid dynamics Compressors Cavity flows Flow (dynamics) Modeling Pressure Heat flux Engineering systems and industry applications Transients (dynamics) Design Heat conduction Wall temperature Cavities High pressure (physics) Fluids Simulation Boundary-value problems Disks Finite element analysis Turbines
Content Type	Text
Resource Type	Article

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