If particles moved by force stoke field follow not blend velocity with it?
By default, the Stoke Field Follow overwrites the Velocity of the particles with the value coming from the Field Source, because the “Blend” property defaults to 100%. This means that 100% of the Stoke Field and 0% of the existing PFlow particle speed will be used. Setting the Blend to 50% will mix them 50/50, but the influence of the Field will be lower per frame, and the speed will grow over time as the Stoke Field blends with its previous values.
This is equivalent to the “Influence (%)” property of the FumeFX Follow operator.