Weighting Function Approximation in Transient Pipe Flow

• Autorzy: Urbanowicz K.
• Języki publikacji: EN

Abstrakty

EN

A very important problem in the transient liquid pipe flow analysis is accurate and effective modeling of hydraulic resistance. The so called integral convolution of the mean local acceleration of liquid and a weighting function need to be solved in a numerical way in order to simulate unsteady resistance. A necessary condition in effective numerical calculations is that the weighting function needs to be defined as a finite sum of exponential terms. The function keeps a constant shape in a laminar flow, in a turbulent flow, its shape changes and it is dependent on the instantaneous Reynolds number. In this article an easy method is presented to determine a proper weighting function in a very straightforward manner in a quick time. A comparison of the determined functions and function prototypes in a frequency domain will be presented as well.

Słowa kluczowe

EN

numerical fluid mechanics; transient flow; hydraulic resistance; weighting function

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2012
• Tom: Vol. 16, No 3-4
• Strony: 263--276
• Opis fizyczny: Bibliogr. 17 poz., rys., tab.

Twórcy

autor

Urbanowicz K.

• West Pomeranian University of Technology, Faculty of Mechanical Engineering and Mechatronics, Department of Mechanics and Machine Elements

Bibliografia

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• [17] Kudźma S 2005 Modeling and Simulation Dynamical Runs in Closed Conduits of Hydraulics Systems Using Unsteady Friction Model, PhD Thesis, Szczecin University of Technology, Szczecin (in Polish)