TBC

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Transport, Biochemistry and Chemistry

D. Schäfer, W. Schäfer, René Therrien

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TBC 2.0 is a further development of the numerical model FLOWBIO developed by René Therrien and Wolfgang Schäfer, Kassel University, March 1993. TBC is able to simulate three-dimensional saturated groundwater flow as well as transport and (bio)chemical reactions of any number of model species. The flow and transport equations are discretized by using the finite difference method, resulting in a seven-point template, or by using the Garlerkin finite element technique, resulting in a 27-point discretization molecule. The use of the seven-point template considerably reduces memory and CPU time required for a solution. The final system of equations is solved by a very fast and efficient preconditioned ORTHOMIN solver.
The biochemical reactions are described by Monod-type kinetics and the equation system is solved by a special DGEAR routine. Chemical reactions can either be defined as a set of fast equilibrium reactions or as kinetic chemical reactions. The equation system is solved by a Newton-Raphson solver.

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