earthquake spectrum
Hi all,
I want to model a tank sloshing with respect to earthquake acceleration. How should I define the earthquake spectrum for ansys cfx? I'm doing mesh motion. Regards; hamed 
CFX cannot model in the frequency domain like modal analysis in FEA. You are going to have to convert it into a displacement versus time and impose that as a mesh motion.

Thanks for the reply.
If I have a graph of displacment vs time, how should input that to cfx as the mesh displacement? best regards; 
Have a look at the tutorial examples for how to implement moving mesh.

Thanks. I know how to do mesh motion with a known equation. But know I have the graph of acceleration vs time. If I manage to integrate it and get the plot of displacement vs time, how can I give this as mesh motion. It is not an equation which I could simply enter for mesh motion displacement.
Regards; 
If you have the equation of motion then why can't you use it?

No I don't have the equation. As I said I just have a graph of displacment vs time. I don't know how to implement this graph to mesh motion.

Quote:
Create a text file from your data with X Y format, then import it into a CFX function. 
Dear Ali,
Can you please be more specific and guide me on this. How should I make the text file and then how can I input it in cfx? Thank you very much. 
Use a 1D interpolation function. I set these up by generating the function with some dummy data then editting it in the command editor to include your data points.

All times are GMT 4. The time now is 04:34. 