- #1

Janko1

- 5

- 0

- Homework Statement
- I am simulating flow around a square and have obtained pressure and velocity in whole domain. I have to calculate the drag and pressure forces, but have trouble with choosing where to take the velocities and pressures.

- Relevant Equations
- $$F_d = 1/2 c_p A \rho u^2$$, $$F = \dfrac{\rho A u_2 \delta t u_2 - \rho A u_1 \delta t u_1}{\delta t}$$

So as stated, I am calculating the pressure and drag forces on an obstacle, but have trouble with which velocities to take. This is my geometry: http://shrani.si/f/3l/13P/2Tihb3iM/projekt2.png . I am guessing that I have to take pressure just before the obstacle and just after the obstacle and the velocities above the obstacle at the beginning and at the end. Is this the right thinking?

Can anyone please help?

Can anyone please help?