Non-reflecting coupling method for one-dimensional finite difference/finite volume schemes based on spectral error analysis

Linkamp, Andreas; Deimel, Christian; Brümmer, Andreas; Skoda, Romuald

doi:10.1016/j.compfluid.2016.10.011

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…It is implemented in the in-house solver FLOAT [8]. The 3D/1D coupling in terms of the pump model used is set and analysed in detail by [18] according to the procedure in [21].…”

Section: D Cfd Approachmentioning

confidence: 99%

Numerical and Experimental Investigations on the Acoustic Characteristics of a Single-Stage Centrifugal Pump

Lehr,

Munsch,

Skoda

et al. 2024

IJTPP

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The acoustic properties of a single-stage centrifugal pump with low specific speed are investigated by means of compressible 3D CFD simulations (URANS) and experiments. In order to determine the pump’s acoustic transmission and excitation characteristics, a four-pole approach in the frequency domain is used. The transmission parameters determined by simulation are compared to experiments in water and air as functions of the Helmholtz number. The results indicate that the acoustic transmission characteristics within the experiments are significantly influenced by the structural compliance of the volute casing in terms of a fluid–structure interaction (FSI). A modelling approach for a one-dimensional representation of the centrifugal pump’s acoustic transmission characteristics in the time and frequency domains is applied to the current pump. As one model parameter, the effective speed of sound in the 1D model needs to be reduced to 607 ms−1 to account for the FSI. The agreement of the simulation results and the experiments underlines the above statement about the influence of the FSI. In a last step, the acoustic excitation parameter, depicted as monopole and dipole amplitudes, at two different blade-passing frequencies (fBP≈[111;169] Hz) are determined for several operating points. Especially for dipole amplitudes, a good agreement between experiments and simulations can be seen. The monopole amplitudes are also of similar orders of magnitude, but show stronger deviations. The cause of discrepancies between the 3D CFD simulations and experiments is believed to be the neglected influence of the FSI and surface roughness as well as the inaccurate reproduction of flow separation at the volute’s tongue due to the use of wall functions. A final important observation made during the numerical investigations is that the excitation mechanisms at the blade-passing frequency are probably independent of the piping system’s acoustic impedance.

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“…It is implemented in the in-house solver FLOAT [8]. The 3D/1D coupling in terms of the pump model used is set and analysed in detail by [18] according to the procedure in [21].…”

Section: D Cfd Approachmentioning

confidence: 99%

Numerical and Experimental Investigations on the Acoustic Characteristics of a Single-Stage Centrifugal Pump

Lehr,

Munsch,

Skoda

et al. 2024

IJTPP

Self Cite

View full text Add to dashboard Cite

show abstract

“…As shown in Figure 4 the superscripts A and B relate to the base points of the two sound characteristics of the up-(c − a) and downstream (c + a) running wave at timestep n. A comprehensive explanation of the method used is described in the authors' previous work [15]. The following paragraph elucidates the model approach of the pumps' transmission behaviour which has geometrical and structural influences.…”

Section: One-dimensional Modelmentioning

confidence: 99%

Simulations and Experimental Investigations on the Acoustic Characterization of Centrifugal Pumps of Different Specific Speed

Lehr

Linkamp

Aurich

et al. 2019

IJTPP

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Subject of discussion are simulations and experimental investigations on the acoustic characterization of three single stage centrifugal pumps of different specific speed. In operation, these pump-types generate pressure pulsation at blade passing frequency, primarily due to rotor-volute-interaction. In order to determine the acoustic excitation it is necessary to know about the pumps’ acoustic transmission parameters. In this paper, a one-dimensional numerical model for transient time-domain simulation is presented, which takes into account the pump geometry as well as the volutes’ structural behaviour by means of the local effective speed of sound. Numerical results for the transmission characteristics of the three different pumps are shown in terms of scattering matrices and evaluated against parameters calculated from measurement results. The experimental analyses are carried out using dynamic pressure sensors in both the suction and the discharge pipe. Assuming solely plane wave propagation, the complex acoustic field on each side is evaluated independently. The so called “two source” method is then used to determine the transmission parameters of the pumps in standstill for a range of frequencies experimentally. Subsequently, the acoustic excitation at varying rotational speed is evaluated by means of measurements at the pumps in operation and presented as monopole and dipole source types for cavitation-free conditions.

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Compressor surge based on a 1D-3D coupled method – Part 1: Method establishment

Huang

Zhang

Zheng

2019

Aerospace Science and Technology

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Non-reflecting coupling method for one-dimensional finite difference/finite volume schemes based on spectral error analysis

Cited by 8 publications

References 44 publications

Numerical and Experimental Investigations on the Acoustic Characteristics of a Single-Stage Centrifugal Pump

Numerical and Experimental Investigations on the Acoustic Characteristics of a Single-Stage Centrifugal Pump

Simulations and Experimental Investigations on the Acoustic Characterization of Centrifugal Pumps of Different Specific Speed

Compressor surge based on a 1D-3D coupled method – Part 1: Method establishment

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