# combustion

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 August 6, 2014, 07:27 combustion #1 Member   zohreh imani nejad Join Date: Feb 2014 Location: gonabad Posts: 55 Rep Power: 5 hi dear formers i have a question about scale of gases like co,co2 ,... can i put them by scale ppm (part per million) in o folder? thanks

 August 6, 2014, 08:53 #2 Senior Member   Laurent DASTUGUE Join Date: May 2014 Location: Chartres, France Posts: 118 Rep Power: 5 Hi Imany, I don't understand for what kind of reason you want to work with ppm. Can you explain it to me, and to us in the same way ? If it is possible i can't help you. But let me say that you should make a conversion to work more easier on OpenFOAM. Hope you will find a way. Laurent

 August 6, 2014, 12:20 #3 Member   zohreh imani nejad Join Date: Feb 2014 Location: gonabad Posts: 55 Rep Power: 5 hi again i want to simulate distribution of co2 in a room the concentration of co2 from pollution source is 400 ppm can i set o folder by fixedValue value 400; ????

 August 7, 2014, 03:50 #4 Senior Member   Laurent DASTUGUE Join Date: May 2014 Location: Chartres, France Posts: 118 Rep Power: 5 Hi, I'm sorry i've searched about a way to define concentration of gases using "ppm" but i haven't found anything. If you find something interesting, i would like to know it. Anyways, you can use the parameter "nMoles" in the "/constant/thermoPhysicalProperties"-file to define the quantity of gas, but i don't know if this can help you. Say me what you can learn, good luck. Laurent

 August 7, 2014, 04:34 #6 Senior Member   Laurent DASTUGUE Join Date: May 2014 Location: Chartres, France Posts: 118 Rep Power: 5 I don't really see what you want me to learn on this Wikipedia page... Maybe you wanted to show me that a volume fraction is dimensionless ? But you have Vco2/Vtotal = 400 ppm = 0.0001 x 400 = 0.04 %. You just have to multiply this value by the scalar density to have the mass of the co2. Laurent

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