The following article from AIChE Journal, entitled “Three-Dimensional Computational Fluid Dynamic Modeling and Simulation of Fine Particle Separation from Water by a Hydrocyclone,” by Vivek Kumar, Mohd Asif, Sudipto Chakraborty and Bhim C. Meikap, published online on Nov. 7, 2011 in Wiley Online Library (, has been retracted by agreement between the authors, the journal Editor in Chief, Michael P. Harold and Wiley Periodicals Inc. on behalf of the American Institute of Chemical Engineers. The retraction has been agreed due to overlap between this article and the following article, “Large Eddy Simulation of Hydrocyclone-Prediction of Air-Core Diameter and Shape,” by Narashima, Brennan, and Holtham published in International Journal of Mineral Processing.