American Society of Civil Engineers


Comparison of Numerical Techniques Used for Simulating Variable-Density Flow and Transport Experiments


by Rohit R. Goswami, (engineer, Geosyntec Consultants, Boca Raton, FL.), T. Prabhakar Clement, (corresponding author), (Professor, Dept. of Civil Engineering, Auburn Univ., Auburn, AL. E-mail: clement@auburn.edu), and Joel H. Hayworth, (Associate Research Professor, Dept. of Civil Engineering, Auburn Univ, Auburn, AL.)

Journal of Hydrologic Engineering, Vol. 17, No. 2, February 2012, pp. 272-282, (doi:  http://dx.doi.org/10.1061/(ASCE)HE.1943-5584.0000428)

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Document type: Journal Paper
Abstract: The writers investigated the relative performance of three different numerical techniques available in the SEAWAT/MT3DMS code by simulating two new variable-density-flow and transport experimental data sets. The experiments were designed to represent two distinctly different variable-density configurations that involve transport of a sinking groundwater plume and a rising groundwater plume. The numerical techniques used for simulating these experiments included the method of characteristics approach (MOC), total-variation-diminishing scheme (TVD), and finite-difference scheme (FD). Both homogeneous and heterogeneous hydraulic conductivity fields were employed in the numerical simulations to explore the effects of heterogeneities. The results indicate that all three numerical methods have limitations and were not able to satisfactorily reproduce the instabilities observed in the experimental data sets. The results show the need for improving the accuracy of numerical techniques that are currently being used for solving variable-density groundwater flow problems.


ASCE Subject Headings:
Groundwater flow
Numerical analysis
Experimentation
Plumes

Author Keywords:
Density-dependent flow
Groundwater
Transport
Dense flows
Numerical methods
MODFLOW
SEAWAT