Trying to integrate for drag

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James Keiser
James Keiser 2022-10-5
回答： Walter Roberson 2022-10-5
I am trying to inegrate using an array with 56 numbers. The formula is rho*integral of uwake(20- uwake) where uwake is the array.
for i=1:totalpts
data=load(fullfile(dir_address,[ifname '_' num2str(i) '.mat']));
dP(i)=mean(data.dp) * (249.0); % differntial pressure % This data is in (inches of water) convert it into SI units
Pressure_Atm(i)=data.pAtm; % atomspheric pressure
Temp_Atm(i)=data.tAtm; % atomsheric temperature at each measured point
z(i)=data.zCurr * (0.0254); % position of the each point along the Z axis of the windtunnel % This data is in inches convert it into SI units
u_wake = sqrt((2*dP)/rho);
end
plot(u_wake,z);
Integrate = u_wake(20-u_wake);
Drag = rho*trapz(Integrate)

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回答（1 个）

Walter Roberson
Walter Roberson 2022-10-5
I suspect
Integrate = u_wake .* (20-u_wake);

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