EVALUATION OF UNSTEADY FLOW RESISTANCES BY QUASI-2D OR 1D MODELS. TECHNICAL NOTE

By G. Pezzinga. 2000

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Systematic Evaluation of One-Dimensional Unsteady Friction Models in Simple Pipelines (2006, methodology): “…the following modification was made gD fV dx dH 2 2 −= changed to gD VfV dx dH 2 −= (5) Similarly, to address the problem of amplification, the sign of the convective term in the IAB model may be modified (independently formulated by Bergant et al., 1999; Pezzinga, 2000; Bergant et al. 2001).”
The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part II—model development, calibration and verification (2005, background): “…1993; Vardy and Brown, 1995, 1996); (iv) local and convective acceleration (Brunone et al., 1991, 1995; Vitkovsky et al., 2000; Bergant et al., 2001); and (v) velocity profiles (Bratland, 1986; Vardy and Hwang, 1991; Eichinger and Lein, 1992; Silva-Araya and Chaudhry, 1997; Pezzinga, 1999, 2000).”
Leak-edge detection (2009, result): “…the very first phase of the transient, the effect of friction—either steady and unsteady—on the leak location is negligible, as was also demonstrated by, e.g. Axworthy et al. (2000), Bergant et al. (2001), Bughazem and Anderson (1996), Louriero and Ramos (2003), Pezzinga (2000), and Wylie (1996).”