Hello,
I have a question about a particular simulation. I'm trying to simulate the statical and dynamic behaviour on a Hydrofoil, like a C-foil used on Quadrofoil. But, I have doubts on the values i should use to the forces.
Can someone please tell me a generic value to introduce in static and dynamic force please?
Thank you!
Pedro
No, i have doubts on wich values i must insert on "force" to make the simulation. Like 1000N or 10000N, understand?
I know the material, I have the profile used, everything, but i know anything about generic values used on this kind of case.
i would say there are no generic values, they are based on the fluid they will be in, the speed they are going and the aerodynamic forces that are generated in addition to any other condtiions they are subjected to (waves..etc).
But, a boat with 150 kg, and no waves... what value should i use?
Fl=CL*A*q for lift and Fd=Cd*A*q
where,
Fl=force due to lift
Fd[ force due to drag
CL - lift coefficient
Cd= drag coefficient
A= plan area of wing/foil
q= dynamic pressure=1/2*rho*v^2
since rho of water =1000kg/m^3 the forces get big fast so typically they run at low alphas so low Cl's and Cd's.
Thank You Sir!
Where can i find values for Cl and Cd?
I would figure out for lift as Fl needs to equal the wt of the vehicle and will vary with speed. Fd - once you figure out the Cl then find out what Cd range is corresponds to and the speed range and you will have an estimate of the forces. You need the drag polar for the hydrofoil or just pick any airfoil like a NACA 0012 and use that - it will be close.
ok... i'm a little newbie to this things and i don't understand.The Area, is of section that is parallel to movement?
What is wt?
My problem, i think, is to find the Cd and the Cl, because it is a C-foil of a boat and i don't find pretty much information about that kind of hydrofoil
I have no idea what a C foil is - you might want to tell us all what that is.
wt=weight
the area is the plan area- aka the lifting surface area - chord length x span for a flat slab type of wing.
Just look up some stuff on lift and drag and how its calculated on google. Easier than me explaining it here.
Off-topic question, but do Hydrofoils allow ships to travel faster? or is it increase the distance between ship deck and the water level?
I think so. Hydrofoils provide less drag on the water that the entire hull. And With hydrofoils, i think you can use less powerfull motores to achieve that speed
you have doubts on the values, how did you come up with them?
what is the static and dynamic case that they are being subjected to?