hi expert..
When we read previous articles about simulation. There are graphs for liquid velocity flow field. Some articles use Time-Averagevelocity and some article use the term Long-Time-Average.. So, I need to know what is the key difference between these two terms. for explanation see attach graphs.. please
Hello,
They both refer to the same thing, that is the averaging of a time dependent quantity in time. Although, using 'Long' ensures that the time used averaging is sufficiently long.
Hope it helps !
OK, thank you sir .... yes your suggestion helps... Can you suggest me the formula how to calculate Time Average properties ?? If I have instantaneous properties with respect to time... any formula or codes in ANSYS Fluent .. please...
The selection of time averaging depends on the frequency oscillation inside the chamber if random variation does not exists. For high frequency oscillation, short time interval is prefered. For slowly varying phenomena, it is always advisable to go for long time averaging. The frequency of oscillation depends on Reynolds number, void fraction etc.
If the flow is highly unsteady and random like a turbulent flow, in addition to the averaging (Mean), statistical properties need to be calculated.
Method to calculate the time averaging is given in the Fluent manual. Hope this will be useful.
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