October 4, 2013

« All News

Rohit Goswami Co-Authors ASCE Journal of Hydrologic Engineering Paper Comparing Modeling Techniques on Variable-Density Flow and Transport Experiments

BOCA RATON, Florida — Geosyntec Engineer Rohit Goswami, Ph.D., EIT, LEED AP, co-authored the paper, "Comparison of Numerical Techniques Used for Simulating Variable-Density Flow and Transport Experiments," published online in the preview manuscript section of ASCE Journal of Hydrologic Engineering. Rohit's co-authors were T. Prabhakar Clement, Ph.D., P.E., Professor and Arthur H. Feagin Chair of Civil Engineering, and Joel H. Hayworth, Ph.D., Associate Professor of Research, both of Auburn University.

In the paper, the authors examine issues with three different numerical techniques available within SEAWAT/MT3DMS (a three-dimensional, saturated groundwater flow program from the U.S. Geological Survey), to simulate variable-density flow fields. They took two test cases (physical experiments) and applied the numerical techniques using the same physical parameters (porosity, hydraulic conductivity, dispersivity, etc.) to simulate them. The team tested the numerical techniques regarding their ability to accurately predict the presence of instabilities and general level of mixing observed in the physical experiments. The results surprisingly showed that the tested numerical techniques could not satisfactorily match results from both physical experiments. However, the different numerical techniques (under various conditions) were able to satisfactorily simulate one of the two experiments. The takeaway point of the research was that practitioners should utilize appropriate numerical techniques to simulate variable-density flows, especially in cases where instabilities are involved.

Rohit earned his Bachelor's in Civil Engineering from Punjab Engineering College in Chandigarh, India, and his MCE and Ph.D. in Civil Engineering from Auburn University. The research presented in the article was part of his doctoral work which focused on the effects of density on groundwater flow and transport (also referred to as variable-density flow and transport). Rohit and Dr. Clement have worked together in publishing four peer-reviewed journal articles, two book chapters and conference proceedings.

Since the research team's findings only reached the publications stage in May 2011, many groundwater modeling practitioners have yet to assess the implications for their own projects/research.