{"refrec":{"BRefID":23578,"RR":"<b>Beckers, J.-M.; Delhez, E.; Deleersnijder, E.</b> (2001). Some properties of generalized age-distribution equations in fluid dynamics. <i>SIAM J. Appl. Math. 61(5)</i>: 1526-1544","BEntID":23578,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>SIAM J. Appl. Math. 61(5)</i>: 1526-1544","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Beckers, J.-M.; Delhez, E.; Deleersnijder, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Beckers, J.-M. <i>et al.</i>","Englishabstract":"The concept of age in fluid dynamics is analyzed in the case of a tracer advection- diffusion equation. From the general solution in a uniform velocity field, it is shown that unexpected symmetry properties arise for the age field. In particular, for a point release, the age field is isotropic, regardless of the direction of the flow and the value of the diffusion coefficient. The analysis is then extended to situations with time-varying currents, where the symmetry can be broken under some circumstances. 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