SimScale CAE Forum

A nice resource for creating time function ramping CSV's

Quite often we are required to ramp boundary condition values so as not to shock the system, most commonly in SimScale for compressible flows using a ramped velocity inlet. Here is a good resource for a suitable function:
https://cirpwiki.info/wiki/CMS-Flow_Numerical_Methods

the excel formula:
= < Final Value>(1/2-1/2COS(PI()*(< current time>/< end time>)))

This makes a smooth ramp from zero to the desired value, from zero time to the ramped end time. When ramping from a non zero value, simply add the desired initial value as a constant term and use the end value minus the initial value as the ‘final value’ in the above function.

Hope this can be of help to somebody someday.

Best,
Darren

6 Likes

Great find Darren! Bookmarked it for future use if needed!

Cheers.

Regards,
Barry