# Phoenics

 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 27, 2015, 20:13 Phoenics #1 New Member   Khurram Gohar Join Date: Mar 2015 Posts: 10 Rep Power: 11 Does any one know how i can calculate the Drag coefficient from total force in phoenics CFD of my 3 blade horizontal axis wind turbine ? When i'm trying to calculate from the output tab in domain settings, it is asking me to give the Reference area in X, Y and Z. I'm a bit confused about calculating area along X,Y and Z axis. can any one help me on how i can find the area ? Blade length is 3 meter total surface area is 5.86 square meters No of blades 3 rotor area is 0.73 square meter. would be grateful if you can also tel me how the power can be measured? I'm using NACA 4412 airfoil.

March 27, 2015, 20:29
#2
New Member

Khurram Gohar
Join Date: Mar 2015
Posts: 10
Rep Power: 11
If any one wants my model of turbine , i can send the solid works file for his/her simulation (through email). furthermore even if anyone can tell me how can i find the areas along x, y and z-axis of attached blade , than i would be grateful. I also would like to know how can the lift be calculated in phoenics.

thanks
Attached Images
 Blade 1.jpg (10.4 KB, 19 views)

October 11, 2018, 10:14
#3
New Member

Anastasios Dalas
Join Date: Oct 2018
Location: Greece
Posts: 5
Rep Power: 7
Quote:
 Originally Posted by Khurram381 Does any one know how i can calculate the Drag coefficient from total force in phoenics CFD of my 3 blade horizontal axis wind turbine ? When i'm trying to calculate from the output tab in domain settings, it is asking me to give the Reference area in X, Y and Z. I'm a bit confused about calculating area along X,Y and Z axis. can any one help me on how i can find the area ? Blade length is 3 meter total surface area is 5.86 square meters No of blades 3 rotor area is 0.73 square meter. would be grateful if you can also tel me how the power can be measured? I'm using NACA 4412 airfoil.
I have the same problem about calculating lift on NACA 4412, can anyone help?

 February 13, 2020, 10:27 #4 New Member   Join Date: Oct 2019 Posts: 11 Rep Power: 6 Hi, Please see the below for a link to information on the force-summation output and the drag-coefficient calculation: http://www.cham.co.uk/phoenics/d_pol...20on%20Objects You are looking for this formula here, which calculates the drag coefficient: Cd_i = F_i/(0.5*RHO_ref*Vel_ref*Area_(ref,i)) You have your reference area, and I will assume you have a reference velocity and density too. From this, if you have included only the rotor elements in the force summation, this will give you a drag coefficient in the spreadsheet, which is output during the run. You can calculate the moments by inputting the coordinate which you would like your moments to be taken around in the final 3 boxes of that menu. There are lots of informative tutorials about PHOENICS here: http://www.cham.co.uk/phoenics_tuts.php There is also a lot of documentation here: http://www.cham.co.uk/documentation.php http://www.cham.co.uk/phoenics/d_pol...c/encindex.htm Thanks, Harry