Unsteady friction models for conservative solution schemes in transient pipe flows

Abstract

The accurate and appropriate simulation of pressure transients (or unsteady flows) in pipeline systems is an essential requirement for many applications. To improve the sensitivity and flexibility of transient analysis, this research uses a conservative solution scheme including all terms in basic equations. Understanding the unsteady hydraulic resistance behavior is of great importance for the dynamic calculation. Various unsteady friction models based on weighting functions have been incorporated and modified in the conservative solution scheme. For transients in compressible flow, the compressibility of gas is the dominant physical property. The proposed model in this research can simulate both water and gas transient flow and has been verified by undertaking laboratory experiments.