- **Main CFD Forum**
(*http://www.cfd-online.com/Forums/main/*)

- - **Unsteady flow - tank drain (please help)**
(*http://www.cfd-online.com/Forums/main/95123-unsteady-flow-tank-drain-please-help.html*)

Unsteady flow - tank drain (please help)Hello Everyone,
For the last 2 weeks I have tried to model an unsteady flow with no viable results. Problem description: Create a 10 meter in diameter cylindrical tank with an outlet nozzle of 1 meter in diameter. How long does it take the fluid level to drop from 30meter above the tank outlet to 1 meter above the tank outlet? The top of the tank is open to the atmosphere. I have done the following: - Created geometry in GAMBIT. (30m height, 10m diameter, w/nozzle 1m above bottom) - Once in FLUENT: Define/Models/Solver/Unsteady Define/Models/Viscous/k-epsilon Define/Operating Conditions/ -Pressure set at 101325 Pa - Gravity check marked Define/Boundary Conditions/ - Open top of cylinder: Vent Inlet @ 0 psig - Nozzle exit: 1 flow rate Solve/Monitors/Residuals -All checked marked (1x10^-5) Solve/Monitors/Statistics -Time and delta time: print Solve/Initialize/Initialize - No initial conditions since at time zero draining has not begun. Solve/Iterate - NOT SURE WHAT TO DO HERE!:eek: PLEASE HELP!!! I am worn out from trying everything possible! (except the right approach:confused:) |

All times are GMT -4. The time now is 03:09. |