An abstract base class for a spatial flow field.
Provides the flow field as a function of the location. This is implemented here for the possibly most simple case: a quiescent fluid.
- xxarray of floats of shape (3, )
Location in the fluid for which to provide the data.
- tuple with two elements
The first element in the tuple is the velocity vector and the second is the Jacobian of the velocity vector field, both at the given location.