D Nigel Johnston

Efficient Methods for Numerical Modeling of Laminar Friction in Fluid Lines

Journal of Dynamic Systems, Measurement, and Control -- December 2006 -- Volume 128, Issue 4, pp. 829-834

An improved method for simulating frequency-dependent friction in laminar pipe flow using the method of characteristics is proposed. It has a higher computational efficiency than previous methods while retaining a high accuracy. By lumping the frequency-dependent friction at the ends of the pipeline, the computational efficiency can be improved further, at the expense of a slight reduction in accuracy. The technique is also applied to the transmission line method and found to give a significant improvement in accuracy over previous methods, while retaining a very high computational efficiency.