This widget has for purpose to set a constant time step for 1d fluid model
(expressed in SI units, ie in second).
 
This is therefore a positive real number.
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 SYRTHES version   : VERSION_SYRTHES
 Name help file  : Le_const_Ts_fluid1d.html
 I. Rupp, C. Peniguel  -  may 2014
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