how coding drag coefficient?

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Lilya
Lilya 2016-8-2
回答： YATIK SHAH 2021-4-14
Hi all, I need kindly help to write a code to calculate drag coefficient as the attached figure.
thank you in advance
  2 个评论
Bob Thompson
Bob Thompson 2016-8-2
Could you expand a little bit more on what you're looking for exactly? All I can determine from the information in the pic is that Cd = 0.0012.
Lilya
Lilya 2016-8-3
The equation is in the first line, this is what I actually want. The wind speed values are in matrix which in form of u, v.

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采纳的回答

Star Strider
Star Strider 2016-8-3
See if this does what you want:
tau = @(U10) 1.22.*[1.2E-3.*((4 < U10) & (U10 < 11)) + 1E-3*(0.49 + 0.065*U10).*((11 <= U10) & (U10 < 25))].*U10.^2;
x = linspace(0, 24.9);
figure(1)
plot(x, tau(x))
xlabel('\itU_{10}\rm')
ylabel('\bf\tau\rm')
grid
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Lilya
Lilya 2016-8-3
Thank you very much for your help. I greatly appreciate it.

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更多回答（1 个）

YATIK SHAH
YATIK SHAH 2021-4-14
tau = @(U10) 1.22.*[1.2E-3.*((4 < U10) & (U10 < 11)) + 1E-3*(0.49 + 0.065*U10).*((11 <= U10) & (U10 < 25))].*U10.^2;
x = linspace(0, 24.9);
figure(1)
plot(x, tau(x))
xlabel('\itU_{10}\rm')
ylabel('\bf\tau\rm')
grid

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