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#1 |
New Member
Juan David Rodriguez P
Join Date: Jan 2015
Location: Milano
Posts: 20
Rep Power: 11 ![]() |
Hi.
I have read already Anton Persson's report describing dieselFoam. I have noticed this solver and sprayFoam have many differences. Is there a description/report of sprayFoam> I ask this becuase I dont know what does Constant Properties in sprayCloudProperties refer to. Also, I wan to know how to set the spray injection temperature and pressure. I know in 0/T or 0/p one can set boundary conditions for these scalars but for the general duct where the spray takes place (the mass of air, for example) Thank you |
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#2 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 ![]() |
You can set the spray temperature (stagnation temperature) in T0. If you want a pressure driven flow in the spray you need to select a coneNozzleInjector as the type, and flowType as pressureDrivenVelocity. You will need a keyword called Pinj which is the injection pressure.
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#3 |
New Member
Juan David Rodriguez P
Join Date: Jan 2015
Location: Milano
Posts: 20
Rep Power: 11 ![]() |
Hi Marcos,
Do you know what parameter describes liquid evaporation? I used Y(component)l in paraview but its scale was from 1 to 2, which seems odd, does not it? If it is not odd at all, then what does it mean? By the way, I am having trouble setting the BC to get an inner flow of air. Could you please give me some guide with respect to this? Thank you. |
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#4 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 ![]() |
What do you mean by the liquid evaporation? The species fractions, parcel mass, etc? Ycomponent is the index of the species in the parcel, my guess is you have 3 species?
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#5 |
New Member
Juan David Rodriguez P
Join Date: Jan 2015
Location: Milano
Posts: 20
Rep Power: 11 ![]() |
Hi Marco,
Oh, I see. Yes indeed, I am working with three species (N2, O2 and Water). My question regarding liquid evaporation was if there exists a variable in OF that represents a vapor fraction of the sprayed species, or that contains information about phase change. Thank you, Marco. |
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#6 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 ![]() |
For lagrangian spray models, diameter would give you some indication of evaporation. The vapour fraction of sprayed species would be the species fraction in the continuous phase I would think. When you plot H2O it should show it increasing where the droplets are evaporating.
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#7 |
New Member
Juan David Rodriguez P
Join Date: Jan 2015
Location: Milano
Posts: 20
Rep Power: 11 ![]() |
Thank you, Marco.
I will follow your recommendation. |
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#8 |
New Member
Juan David Rodriguez P
Join Date: Jan 2015
Location: Milano
Posts: 20
Rep Power: 11 ![]() |
I am investigating how sprayFoam works. And I have seen that inside the solver folder there are only pEqn.H, rhoEqn.h and UEqn.H, but sprayFoam.C uses also YEqn.H and EEqn.H. My question is where does sprayFoam.C load them from?
Thanks. |
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#9 |
Member
Neilson Whit
Join Date: Aug 2011
Posts: 74
Rep Power: 15 ![]() |
I think It uses the ones reactingParcelFoam. Please check it...
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#10 |
New Member
Juan David Rodriguez P
Join Date: Jan 2015
Location: Milano
Posts: 20
Rep Power: 11 ![]() |
I also have that intuition, Neilson. But I don't know how to confirm it.
Anyway, sprayFoam seems to calculate at each iteration these three measures, D32, D10, and Dmax. Other solvers, like reactingParcelFoam don't. How can I register these values with that solver? Is it possible? Thanks/ |
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#11 | |
Member
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Neilson is correct. If you check ''sprayFoam.dep", you will find
Quote:
Best, Likun |
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#12 |
New Member
heruitian
Join Date: Jun 2018
Posts: 6
Rep Power: 8 ![]() |
Hi,
I am trying to simulate the n-dodecane evaporation based on sprayFoam in OF. With the C12H26 file in each time documents, I define the vapor penetration just like the definition in other commercial software. But the vapor penetration is shorter than the liquid penetration in the initial time. It's unacceptable in the experiments. I wonder if there is mistakes in vapor penetration definition or the setting values, such as KHRT parameters in OF,which can let the droplet evaporate faster in the initial time? ![]() Thank you! |
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#13 |
Member
Riddhideep Biswas
Join Date: May 2020
Posts: 30
Rep Power: 6 ![]() |
Hello everyone.
I am simulating a case in sprayFoam and I want to keep an atmospheric pressure boundary condition to the outlet of the domain. What value should I give for this? Should I give 0 Pa(i.e. the gauge pressure) or should I give 1e5 Pa(i.e. the absolute pressure)? Anyone please help me as I am new to sprayFoam solver and do not understand it well. |
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#14 |
Member
Join Date: Mar 2019
Posts: 81
Rep Power: 7 ![]() |
Dear Foamers,
I am trying to simulate a pure pressure driven flow through a nozzle using speayFoam in OpenFoam1812. I would like to obtain the mass flow rate through the nozzle. Here is the relevant info from sprayCloudProperties file: Code:
injectionModels { model1 { type coneNozzleInjection; SOI 0; massTotal 1e-5; parcelBasisType mass; injectionMethod disc; flowType pressureDrivenVelocity; Pinj constant 1e6; outerDiameter 2e-4; innerDiameter 0; duration 50e-3; position (0 0.5 0); direction (0 -1 0); parcelsPerSecond 20000000; flowRateProfile constant 1; ![]() I really appreciate your thoughts on this. Regards, MJ |
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#15 | |
Member
Join Date: Mar 2019
Posts: 81
Rep Power: 7 ![]() |
Quote:
I believe you should use the absolute pressure (something like the following): Code:
dimensions [1 -1 -2 0 0 0 0]; internalField uniform 1e06; boundaryField { walls { type zeroGradient; } outlet { type fixedValue; value uniform 1e06; } } ![]() Cheers, MJ |
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#16 | |
Member
Join Date: Apr 2014
Location: N/A
Posts: 50
Rep Power: 12 ![]() |
Quote:
Did you manage to answer this question? |
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#17 |
New Member
mingyang
Join Date: Jul 2023
Posts: 1
Rep Power: 0 ![]() |
Dear Foamers,
In the calculation example of sprayFoam delivered with OpenFoam, the working medium is hydrocarbon C7H16. I want to use this calculation example to adapt the working medium to liquid NH3 for numerical simulation, observation and study of its spray effect. At present, the first step is to know how to convert the spray working medium in the tutorials.I uploaded my case files to the git hub,https://github.com/Fancy2121/sprayfo...m/aachenBomb,I would appreciate some advice. ![]() ![]() |
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Tags |
dieselfoam, injection temperature, sprayfoam |
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