- #1
mizisyafie
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Homework Statement
Hello guys, I am here and really need your help.
In the figure below, the water flow from inlet and then out at outlet with velocity, v = 0.71 m/s. The objective is to calculate find the drag force and lift force act on fishing lure. I have done Ansys Fluent analysis but I need to validate the result from Ansys with calculation analysis. I really stuck about how the way to calculate this. I hope you guys can help me to show the way to calculate.
Here is the result executed from Ansys CFD. In the Ansys, I use pressure based mode.
Result from CFD Ansys:
Coefficient of Drag, Cd = 0.02
Coefficient of Lift, Cl = -0.0068
For x-component (Drag Force)
Pressure Drag = 0.03239 N
Coefficient of Pressure, Cp = 0.013
Viscous Drag = 0.01334 N
Coeeficient of Friction, Cf = 0.0059
Total Drag = 0.04574
For y-component (lift Force)
Pressure Drag = -0.016
Coefficient of Pressure, Cp = -0.0073
Viscous Drag = 0.0012
Coeeficient of Friction, Cf = 0.0005
Total Lift = -0.015
The picture below is clearly show the situation:
Given data :
Data of Fluid (Water):
Density of water = 998.2 kg/m^3
Viscosity = 0.001003 kg/m-s
Velocity, v = 0.71
Boundary Condition Data:
Length of X = 0.97676 m
Length of Y =0. 22656 m
Length of Z = 0.225 m
Volume of Water = 0.049774 m^3
Surface Area = 0.98861 m^2
Fishing Lure Data
Mass of Fishing Lure, m : 0.01874 kg
Volume of Fishing Lure, V : 0.000018196 m^3
Surface Area (Wetted Area), A = 0.0050176 m^2
Fishing Lure Body Length, L=0.095 m
Homework Equations
The equation that i used to calculated this is F=ma=Drag but the percentage error is very large so that the validation is not acceptable. Now i am very stuck because i am confusing whether to put mass in equation F=ma which is mass of fishing lure or mass of water?
pressure drag + friction drag = drag force
I think the equation above can help me but since i am very slow in my class :)..
My problem is also
1)i do not know how to find pressure drag
2)if i want to find lift force, what equation i want to use?
The Attempt at a Solution
I really need you guys to help me in anyway to explain me in how the exactly i must do to calculate this problem.