So, for this reason it is essential for us to ensure that the flow is made turbulent. So, we have to use turbulence stimulators; turbulence has to be stimulated, we have to stimulate turbulence in the fore part of the ship, and how do you do it?
We have to introduce artificial roughness at the front end of the ship so that the flow becomes turbulent because of existence of rough surface, as if we are introducing forcible turbulence on the ship’s fore body. And what we use is called trip wire, this is the normal turbulence stimulator used in ships that is, I have got a ship model here, I can put a wire right on the front of the ship, or if this is a FP about five percent length aft of a FP, LWL, length on water line, normally model test we use length on water line. So, I can put a trip wire here that is, if I draw the section here, the section of the ship may be like this, I put a small trip wire all along the model with small anchors holding it by pins; if I have got a wax model, I can put pins and hold the trip wires- small pins which you insert inside the model surface.