Lookup tables

ali.m.1 · March 30, 2016, 05:45

Hi all

I am trying to inject particles using a lookup table. My problem is that if I change the mass flowrate on the lookup table, nothing happens to the results. The solver seems to ignore the lookup table, and use the values in other constant dictionaries.
I've tried the tutorial 'cylinder' (reactingParcelFilmFoam) to check that it wasn't just my case, but even when I change the mass flow rate column in that lookup table, the values in the log file don't change.
Does anyone have any idea? Both solvers require 'massTotal' in a constant dictionary. If I change this value, the values change in the log file. I've tried to delete this line, however the solver won't run without it.
I'm using of 3.0.x for reference.
Any help is appreciated!

ali.m.1 · March 30, 2016, 09:40

So I've figured out that the mass flowrate is calculated from the parameters you give in the 'kinematicCloudProperties' dictionary. It takes massTotal and divides by the duration to get kg/s. This is fine, and may seem obvious, but where I'm getting stuck is finding out what the values of mDot are for in the LookupTable? As far as I can see it makes no difference to the results whatsoever.

I hope this makes my query clearer.

ali.m.1 · May 13, 2016, 07:11

Hi All

Maybe this should be in the programming section, but I'll ask it here anyway since I've already started a thread.

I have a made a kinematicCloudLookupTable which refreshes each timestep. My problem is that the solver does not look at the lookupTable each time step, but rather just takes the first value.
Does anyone know how I can force the solver to re-look up the values each time step? The .C files concerned are either InjectionModel.C, or KinematicLookupTableInjetcion.C. I have tried to include some sort of loop in these, (like in the main solver- with pimpleLoop) but with no sucess.

Any help would be appreciated. I've been stuck on this for a week now.

March 30, 2016, 05:45	Lookup tables	#1
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	Hi all I am trying to inject particles using a lookup table. My problem is that if I change the mass flowrate on the lookup table, nothing happens to the results. The solver seems to ignore the lookup table, and use the values in other constant dictionaries. I've tried the tutorial 'cylinder' (reactingParcelFilmFoam) to check that it wasn't just my case, but even when I change the mass flow rate column in that lookup table, the values in the log file don't change. Does anyone have any idea? Both solvers require 'massTotal' in a constant dictionary. If I change this value, the values change in the log file. I've tried to delete this line, however the solver won't run without it. I'm using of 3.0.x for reference. Any help is appreciated!

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March 30, 2016, 09:40		#2
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	So I've figured out that the mass flowrate is calculated from the parameters you give in the 'kinematicCloudProperties' dictionary. It takes massTotal and divides by the duration to get kg/s. This is fine, and may seem obvious, but where I'm getting stuck is finding out what the values of mDot are for in the LookupTable? As far as I can see it makes no difference to the results whatsoever. I hope this makes my query clearer.

May 13, 2016, 07:11		#3
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	Hi All Maybe this should be in the programming section, but I'll ask it here anyway since I've already started a thread. I have a made a kinematicCloudLookupTable which refreshes each timestep. My problem is that the solver does not look at the lookupTable each time step, but rather just takes the first value. Does anyone know how I can force the solver to re-look up the values each time step? The .C files concerned are either InjectionModel.C, or KinematicLookupTableInjetcion.C. I have tried to include some sort of loop in these, (like in the main solver- with pimpleLoop) but with no sucess. Any help would be appreciated. I've been stuck on this for a week now.