Coanda-Effect Screens Research

Schematic diagram
Schematic diagram
(click for larger image)

Screen under test photo
Screen under test
(click for larger image)


  • Coanda-Effect Screen Analysis Software - A Windows-based program for analysis and design of Coanda-effect screens.  Version 0.7.1 was posted on July 6, 2015. This program is a 32-bit application for Windows 95 and later systems.
  • Version 0.7.0 implemented a new default model for predicting screen discharge capacity, and also allows the use of custom screen parameters as described in the 2013 conference paper, below. The new default model and its parameters were developed following publication of the 2013 conference paper. New output and user-guidance messages have also been added to the program to help ensure that analyses are performed within the range of flow conditions that has been used in previous lab tests.
  • Version 0.7.2 fixes some problems with poor convergence of the numerical routines that calculate the flow profile. The problems only occurred for structures with a very small vertical drop across the accelerator plate.


  • New Testing of Coanda-Effect Screen Capacities (2013) - This paper and poster describe a new model for predicting screen capacities developed from recent testing in the hydraulics laboratory.
  • Design Guidance for Coanda-Effect Screens (2003) - Reclamation Research Report R-03-03.  This report applies the Coanda computer program to develop design guidance recommendations for a variety of screen configurations.  Case studies of actual screen installations are provided.
  • Hydraulic Performance of Coanda-Effect Screens (2001) - This paper presents the complete numerical model for determining the discharge through a Coanda-effect screen structure. For a given inflow rate, the model computes the flow profile along the length of the screen and the total discharge through the screen as a function of the structure dimensions (e.g., drop height, screen length, screen arc radius, etc.) and the screen material properties. The paper also presents a refined model for predicting the discharge characteristics of tilted-wire screen materials as a function of the tilt angle, wire size, slot size, and the Froude number, Reynolds number and Weber number of the flow over the screen.
  • Laboratory Testing and Numerical Modeling of Coanda-Effect Screens (2000) - This paper describes the mechanics of flow over and through Coanda-effect screens and presents a numerical model for predicting screen performance. The paper also presents a model for evaluating the discharge coefficients of tilted-wire screens and shows that the discharge coefficient is a unique function of the Froude number and the screen geometry.
  • Hydraulic Testing of Static Self-Cleaning Inclined Screens (1995) - This paper reports results of the first series of laboratory tests conducted by Reclamation.

Links: Some Commercial Sources for Coanda-Effect Screens

Last Updated: 6/17/16