Field averaging in a certain time interval

misakagan · December 9, 2009, 05:59

Greetings.

As a quite new OpenFOAM user I am on a task to simulate turbulent round jets, for which I am using LES with dynamic Smagorinsky model.

My question is about the sampling of the turbulent data. I could not find how field averages for a certain time interval are done. As expected, I would like to collect statistics after the jet develops entirely into the region, i.e. not starting from the first time step.

Any helps will be appreciated.

misakagan · December 11, 2009, 05:39

Maybe giving an example would help to gather some information.

I want to study Umean between times 200-500 for example, since the interval 0-200 is reserved for the developing of the flow. As far as I can see OpenFOAM does the averaging only for the time interval 0-500, as the averaging starts from the first time step and ends with the final time step.

Anyone knows a solution? Do I need to implement new code?

December 9, 2009, 05:59	Field averaging in a certain time interval	#1
misakagan New Member Join Date: Nov 2009 Posts: 17 Rep Power: 16	Greetings. As a quite new OpenFOAM user I am on a task to simulate turbulent round jets, for which I am using LES with dynamic Smagorinsky model. My question is about the sampling of the turbulent data. I could not find how field averages for a certain time interval are done. As expected, I would like to collect statistics after the jet develops entirely into the region, i.e. not starting from the first time step. Any helps will be appreciated.

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December 11, 2009, 05:39		#2
misakagan New Member Join Date: Nov 2009 Posts: 17 Rep Power: 16	Maybe giving an example would help to gather some information. I want to study Umean between times 200-500 for example, since the interval 0-200 is reserved for the developing of the flow. As far as I can see OpenFOAM does the averaging only for the time interval 0-500, as the averaging starts from the first time step and ends with the final time step. Anyone knows a solution? Do I need to implement new code?