Learning Forum

[ahmedshafie]

I tried to calculate Cp but i got non intuitive answers , i go to report ,forces , check center of pressure , my submarine was symmetric around x plane ( vertical plane ) so i checked it and input zero value ,i choose from wall zone the submarine and hit print , i rechecked the values in moments and its not zero at all . n

[Keyur Kanade]

Please check nArrayThere are few threads on center of pressure on forum. Please use search for the same. nThere are few threads on center of pressure on forum. Please use search for the same. nn/forum/discussion/11820/center-of-pressurennRegards,nKeyurnGuidelines for Posting on Ansys Learning ForumnHow to access ANSYS help linksnn

[ahmedshafie]

thanks for your reply , i already tried this formula ,and added viscous force but when calculating moment its not zero , also i open help there is nothing there can help me for center of pressuren

[DrAmine]

Around center of pressure the moment due to pressure force is zero. There is no unique solution here and some additional input is required. Mathematically you have on LHS a matrix 3*3 whith diagonal zero and anti-symmetric (aij=-aji) time the position vector of center of pressure = RHS= Moment vector around origin (0,0,0)n

[ahmedshafie]

thanks for your reply . the additional info is that its in symmetric plane x=0 so how can i calculate cp? n

[ahmedshafie]

n

[DrAmine]

I guess I provided the way to do that. You have the pressure force and moment around origin you then build up your matrix plus your symmetry assumption. n

[ahmedshafie]

thanks for your generous answern