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research-article

Efficient CFD model for transient laminar flow modeling: pressure wave propagation and velocity profile changes

[+] Author and Article Information
Nuno M. C. Martins

CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
nunomiguelmartins@tecnico.ulisboa.pt

Bruno Brunone

Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti, 93 – 06125 Perugia, Italy
bruno.brunone@unipg.it

Silvia Meniconi

Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti, 93 – 06125 Perugia, Italy
silvia.meniconi@unipg.it

Helena M. Ramos

CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
helena.ramos@tecnico.ulisboa.pt

Didia Covas

CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
didia.covas@tecnico.ulisboa.pt

1Corresponding author.

ASME doi:10.1115/1.4037504 History: Received January 31, 2017; Revised July 17, 2017

Abstract

In this paper, the analysis of fast laminar transients in pressurized pipes is developed using a Computational Fluid Dynamics model (CFD), combined with the Zielke model and laboratory data. The systematic verification of the performance of the CFD model executed in the first part of the paper allows defining the most efficient set of the discretization parameters capable of capturing the main features of the examined transient. In this framework, the crucial role of radial discretization is pointed out. In the second part of the paper, the refined and efficient CFD model is used to examine some aspects of interest for understanding the dynamics of transients. Specifically, the uniformity of the instantaneous pressure distributions along the pipe radius, which validates the results of the most popular quasi-2D models, has been revealed. Moreover, it has been shown that the strongest link between the wall shear stress and the axial component of the velocity occurs in the region close to the pipe wall as well as that the time-shift between the wall shear stress and the local instantaneous flow acceleration increases significantly as time elapses.

Copyright (c) 2017 by ASME
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