['While', 'a', 'traditional', 'two', '-', 'compartment', 'model', 'assumes', 'uniform', 'concentration', 'of', 'a', 'material', 'in', 'each', 'compartment', ',', 'the', 'present', 'two', '-', 'compartment', 'model', 'uses', 'a', 'computational', 'fluid', 'dynamics', '(', 'CFD', ')', 'technique', 'in', 'the', 'water', 'compartment', 'to', 'evaluate', 'temporal', 'development', 'of', 'three', '-', 'dimensional', 'profiles', 'of', 'the', 'velocity', 'and', 'concentration', 'fields', '.']