[kanaha]

Hello All;

I'm new member of this forum but I've figured many problems out with your posts before looking as a guest member. Firstly, I would like to thank all of you. And first time I can't find answer of my question in forum :/

I'm trying to setup a free fall object simulation on CFX. Object will be free at 800 meters until reach 300 m. Free fall rule says my final speed will be around 100 m/s but I should keep it under 50 m/s and it depends on my design. But how can I test my design? I m very confused about boundary conditions. I setup transient analysis and I've written CEL function at Inlet of enclosure as ' g*t ' . With this CEL, I can't verify my design whether vertical speed is under 50 m/s because it's increasing independent with my design.
And I changed CEL function at inlet as
' (9.81 [m/s^2] + areaAve(Force Y)@object) / 0.5 [kg] ) * t '
But this time CFX doesnt accept this CEL because of Force Y is doesnt exist in CFX setup.

Do you have any idea about my problem?

Thank you all.