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

- - **convergence check:grid and time-step size**
(*https://www.cfd-online.com/Forums/main/106005-convergence-check-grid-time-step-size.html*)

convergence check:grid and time-step sizeDear all,
I want to do a convergence check for the spatial resolution (grid) and the temporal resolution (time-step-size) of my simulations. I want to do some simulations using pulsatile flow and compare them with simulations using the average velocity of this pulsatile profile. Furthermore I want to do some simulations with the profile upscaled about 2 times. Do I have to do the convergence checks for all of this situations or is it enough to do them with the (let's say) most dramatic situation: pulsatile, upscaled (large velocity and velocity-gradients)? And is there kind of a rule how to proceed with these 2 convergence checks: how many grids, how many time-steps, how to combine them? I am really thankful for any idea and help! Lilly |

Quote:
be careful in taking convergence check by fixing h or dt... the monotone convergence study should be performed fo vanishing ratio dt/h, when you fix one parameter you must be sure that the value is very very small otherwise your convergence will be altered when the error reaches that magnitude order |

All times are GMT -4. The time now is 05:55. |