Abstract
Several techniques have been proposed for determining two- or three-dimensional velocity fields from measurements of one passive scalar. It is shown that measurements of one scalar and knowledge of the equation governing its transport determine a velocity field, only up to an additive vector field locally perpendicular to the gradient of the scalar field but otherwise arbitrary. Three previously proposed procedures for selecting a unique velocity field from among the uncountable infinity consistent with the scalar transport data and equation are then discussed, and it is shown that a recent ‘‘iterative inversion’’ procedure for ‘‘solution’’ of a singular linear equation system (obtained using only measurements of one scalar and the equation governing its transport) cannot converge as claimed. A method for determining the correct n-dimensional (n=2 or 3) divergence-free velocity field from measurements of n−1 passive or reactive scalars is then developed. Finally, it is shown how the velocity field in an n-dimensional compressible flow can be determined from measurements of density and n−1 passive or reactive scalars.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 8:09 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 6, 2024, 6:06 p.m.) |
Indexed | 1 year, 5 months ago (March 9, 2024, 5:30 a.m.) |
Issued | 30 years, 4 months ago (April 1, 1995) |
Published | 30 years, 4 months ago (April 1, 1995) |
Published Print | 30 years, 4 months ago (April 1, 1995) |
@article{Pearlstein_1995, title={On the determination of solenoidal or compressible velocity fields from measurements of passive or reactive scalars}, volume={7}, ISSN={1089-7666}, url={http://dx.doi.org/10.1063/1.868599}, DOI={10.1063/1.868599}, number={4}, journal={Physics of Fluids}, publisher={AIP Publishing}, author={Pearlstein, Arne J. and Carpenter, Bonnie N.}, year={1995}, month=apr, pages={754–763} }