Premium
Damping of water hammer oscillations – comparison of 3D CFD and 1D calculations using two selected models for pipe friction
Author(s) -
Riedelmeier Stefan,
Becker Stefan,
Schlücker Eberhard
Publication year - 2014
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201410335
Subject(s) - piping , water hammer , oscillation (cell signaling) , mechanics , computational fluid dynamics , hammer , structural engineering , engineering , materials science , geotechnical engineering , physics , mechanical engineering , chemistry , biochemistry
Water hammer calculations are important for power plants, drinking water systems and procedural facilities. In most cases, the piping systems are very big and the probability of a resonance between a part of the piping system and a hydraulic oscillation resulting from water hammer is very high. The limiting factors for the amplitudes of the structural stresses and strains are the structural and hydraulic damping. In general, one‐dimensional codes based on the method of characteristics with quasi‐steady friction models are used to calculate the hydraulic system. This results in too small damping of the pressure oscillation and thus in an overestimation of the structural loads. Two models from the literature for a more physical reproduction of the fluid damping using one‐dimensional codes are presented and compared with a quasi‐steady pipe friction model. Additionally, a three‐dimensional computational fluid dynamics simulation of a water hammer oscillation in a small pipe section including a 90°‐bend was carried out. A comparison of the results of the three‐dimensional simulation and the one‐dimensional calculations with regard to the pressure and friction velocity distributions was performed, the performance of the models was evaluated and the limits of validity were identified. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)