ACUSIM Mixing CFD Webinar: PAX Water Success Story

By: Shing Pan
Publication Date: 28 Jan 2010

Applying Large Scale CFD Computation to Active Mixing in Large Potable Water Storage Tanks

Date and Time

Thursday, January 28, 2010
9:00 am - 10:00 am, Pacific Standard Time

Thursday, January 28, 2010
5:00 pm - 6:00 pm, Pacific Standard Time


Join us for a complimentary 1 hour webinar where our featured speakers will present how CFD Simulation has allowed PAX Water Technologies to predict and demonstrate the performance of the Lily mixer for full scale industrial applications.

PAX Water Technologies has developed and deployed a small submersible mixer with a unique impeller design that homogenizes water temperature and composition in large potable water storage tanks. The continuous operation of this mixer, called the “Lily”, prevents temperature and chemical stratification within storage tanks containing several millions of gallons using only a 4 inch impeller and consuming less than 300 W of power.

Although the performance of the Lily mixer is well proven with evidencefrom several real world tanks, a CFD model has been developed by PAX that provides unique insight into the hydrodynamics prevailing in these tanks for which detailed experimental data is almost impossible to acquire.

The simulation of the hydrodynamics within these large storage tanks is particularly challenging due to the large volume of fluid involved. It usually requires the solution of very large models (up to 150 million elements). The large differences in the length, velocity, and time scales associated with this application make it challenging both for mesh generation and CFD solver technology. AcuSolve, ACUSIM’s flagship CFD code, combined with high-performance computer has proven to be very successful and efficient at performing these simulations.

A comparison of the AcuSolve solutions of active mixing with experimental data at laboratory scale and at full scale will be discussed. The extrapolation for very large tanks (up to 9 million gallons) will be also presented. The success of this computational model makes it possible for PAX to use CFD as a tool to support the product for specific customer cases and also to support the design and optimization of the Lily impeller.

Featured Presenters

Robin Giguere, PhD Mixing Process Scientist, PAX Scientific Inc.

Dr. Robin Giguere is a mixing process scientist at PAX Scientific Inc. He has expertise in the areas of industrial mixing, multiphase flow, CFD simulation and high performance computation. Since he joined PAX, Dr. Giguere leads the R&D effort on the design and optimization of impellers. He designs and executes experimental measurements and CFD simulations evaluating impeller performance on laboratory-scale rigs.

He also performs full scale CFD simulation of active mixing in large potable water storage tanks with typical volumes up to 10 million gallons, requiring meshes up to 150 million elements. These models run 24/7 on high-performance parallel computers with up to 128 processors.

Before coming to PAX, he conducted research with the URPEI group at École Polytechnique of Montréal, where he took part in the development of CFD finite element codes and image reconstruction techniques for electrical tomography. He performed industrial projects on modeling mixing technologies for Total Petrochemicals and Atofina and he also worked for Petro-Canada’s Montréal refinery, developing computer solutions for gasoline blending and assessing mixing technologies for crude tanks.

Dr. Farzin Shakib, CEO and Founder, ACUSIM Software, Inc.

Dr. Farzin Shakib is CEO, founder and lead technologist of ACUSIM Software, the developer of AcuSolve. Under his leadership, ACUSIM Software has become a premier name in CFD solver solutions with customers encompassing the automotive industry, electronics cooling, chemical processing, bio-medical, consumer products, oil and gas, alternative energy, and national labs and universities.

As one of the leading U.S. experts in the field of computational fluid dynamics, Dr. Shakib has spent the past twenty six years developing CFD packages, eighteen of which has been in commercial software. He has extensive knowledge and experience in fluid mechanics and finite element analysis, including high performance computing and fluid/structure interaction.

Dr. Shakib received his Ph.D. in Mechanical Engineering from Stanford University, under the advisorship of Professor Thomas J.R. Hughes. Prior to ACUSIM, he worked at Centric Engineering Systems and NASA Ames Research Center.