Top tips for automated speed line generation
Here are six tips to getting the most out of the automated speedline capabilities in the ADS Workbench:
- Begin with an operating point that is close to predicted peak efficiency for each speedline. While the automated speedline generator will function with any converged operating point between numerical stall and choke, it works most efficiently when the operating point is close to predicted peak efficiency. This will reduce the number of points required to construct the speedline, and as a result, the turnaround time and computational cost.
- Make sure the initial operating point is properly defined and converged. Take extra care to ensure you have properly captured key design features and aerodynamic conditions. Garbage in = garbage out!
- Double check your runtime preferences to ensure maximum throughput. Be sure to double check your runtime preferences in the Window>Preferences>Run section of the workbench to make sure the speedline generator can take advantage of as many solvers as you have licensed.
- Let the workbench do its thing. Once the automated compressor speedline flow has been initiated, give it time to do its thing. It will first initiate simulations at 95%, 98%, 100%, 102% and 105% of exit static pressure, then three points at a time to work its way towards numerical stall and choke. The full process usually requires 3-5 additional iterations, resulting in 12-20 operating points per speedline.
- Use the "Extend Stall" and "Extend Choke" options to creep closer to numerical stall and choke. These options will add three points between the last known converged and unconverged points near stall and choke respectively.
- Use the "find target mass flow" option to obtain predictions for a targeted flow rate. In Code Leo, the mass flow rate is a dependent variable, not an independent variable. With this option, the ADS Workbench attempts to pinpoint the exit static pressure value that produces the targeted mass flow rate. Three operating points are configured and queued for execution based on the targeted mass flow rate and derived relationship between exit static pressure and mass flow rate.