Simplified Evaluation of Added Hydrodynamic Mass for Intake Towers

Abstract

For the preliminary phase of design or safety evaluation of intake‐outlet towers, the hydrodynamic interaction effects can be most simply represented in earthquake response analysis by added hydrodynamic mass distributed over the height of the tower. A simplified procedure is developed to evaluate the added hydrodynamic mass for towers of arbitrary cross section, having two axes of symmetry and dimensions varying along the height. It is demonstrated that the added mass associated with surrounding (outside) water or inside water can be determined to a useful degree of accuracy without rigorous three‐dimensional analysis of the two fluid domains. Standard data are presented for convenient implementation of the simplified procedures developed in this paper.