@article{jith_boundary_2018,
	title = {Boundary {Layer} {Impedance} model to analyse the visco-thermal acousto-elastic interactions in centrifugal compressors},
	volume = {81},
	issn = {0889-9746},
	url = {http://www.sciencedirect.com/science/article/pii/S088997461730573X},
	doi = {10.1016/j.jfluidstructs.2018.05.002},
	abstract = {Conventional acousto-elastic interaction studies on centrifugal compressors generally ignore the dissipative effects of visco-thermal phenomena present in all acoustic fluids. This work presents a numerically efficient framework for solving acousto-elastic problems, while taking visco-thermal effects into consideration, in centrifugal compressor-like geometries in the frequency domain. Compared to conventional acousto-elastic analyses, the framework enables the computation of a more realistic estimate of the frequency response of a centrifugal compressor. The acoustic fluid is modelled using Boundary Layer Impedance (BLI) model which accounts for dissipative visco-thermal effects through an impedance-like boundary condition. An improved finite element implementation is presented which reduces the computational time of the BLI acousto-elastic model to almost half, while not compromising on accuracy. To further reduce the computational cost, a Krylov subspace based reduced order model (ROM) is developed and implemented in the analysis. The ROM is specifically designed to handle frequency dependent system matrices encountered in the BLI acousto-elastic analysis.},
	urldate = {2018-05-23TZ},
	journal = {Journal of Fluids and Structures},
	author = {Jith, Jithin and Sarkar, Sunetra},
	month = aug,
	year = {2018},
	keywords = {Acousto-elastic interaction, Centrifugal compressor, Model order reduction, Visco-thermal acoustics},
	pages = {179--200}
}

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This work presents a numerically efficient framework for solving acousto-elastic problems, while taking visco-thermal effects into consideration, in centrifugal compressor-like geometries in the frequency domain. Compared to conventional acousto-elastic analyses, the framework enables the computation of a more realistic estimate of the frequency response of a centrifugal compressor. The acoustic fluid is modelled using Boundary Layer Impedance (BLI) model which accounts for dissipative visco-thermal effects through an impedance-like boundary condition. An improved finite element implementation is presented which reduces the computational time of the BLI acousto-elastic model to almost half, while not compromising on accuracy. To further reduce the computational cost, a Krylov subspace based reduced order model (ROM) is developed and implemented in the analysis. 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