- **CFX**
(*https://www.cfd-online.com/Forums/cfx/*)

- - **Piecewise function to model time-dependant BC
**
(*https://www.cfd-online.com/Forums/cfx/22400-piecewise-function-model-time-dependant-bc.html*)

Piecewise function to model time-dependant BC
Hi
I am in the need to model the flow of blood passing through the coronary arteries. The inlet BC should be pressure driven by a typical Aortic Pressure Waveform which is a very oddly shaped function of Pressure vs. Time as some parts are linear and some quadratic or higher order.. it would be more accurate to model it as a piecewise function. I need to know how to define piecewise functions in CEL expressions to model the time-dependant pressure at the inlet for this transient analysis. Thanks |

Re: Piecewise function to model time-dependant BC
1)Make use of the step function. You can turn on/off an equation on a particular time range.
2)Just another suggestion. Create a 2D data with time & pressure and then import it to Pre using User Function. |

Re: Piecewise function to model time-dependant BC
Thanks
It seems that your 2nd suggestion was better and quicker.. |

All times are GMT -4. The time now is 06:01. |