Hello
given the poor description you gave (no references, just a dark picture) I guess you just have to make an undulation of the contour, undulation done using a Sinus or a Cosinus.
bending could also be done but I think it is done by natural gravity and is not taken into account in the curves. Dendro seems the best to mesh these curves. Mesh Piping, Pipe, Curve piping are quite long.
