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Gas/odour Dispertion

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Old   February 22, 2010, 19:49
Default Gas/odour Dispertion
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andre alho
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Hi.

I want to make a simulation of a ventilated room where i want to observe the dispersion of gas released by a source (a point in the room).

How can i configure the source of gas and how can i observe the concentratio of that gas in all room??

thanks
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Old   February 23, 2010, 04:33
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Ganapathy Iyer
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You will have to solve this a a multiphase simulation.
You can create a mass flow inlet, or a velocity inlet for the gas. Initialize the whole domain with say AIR and let the inlet give GAS to the domain. You would ideally run this as transient as you want to look at the time varied dispersion of the gas.
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Old   February 23, 2010, 09:47
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Quote:
Originally Posted by Ganapathy View Post
You will have to solve this a a multiphase simulation.
You can create a mass flow inlet, or a velocity inlet for the gas. Initialize the whole domain with say AIR and let the inlet give GAS to the domain. You would ideally run this as transient as you want to look at the time varied dispersion of the gas.
thanks

i already made that simulation and i used the particle tracks to observe the dispertion of the gas.
how can i make an animation with contours of the concentration of that gas (without use particle tacks) ?
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Old   February 23, 2010, 13:05
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Adil Eshack
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hey can u tell me how you managed to do the simulation.. i am trying same but not working
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Old   February 23, 2010, 23:52
Default Dont use Particle tracks
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Don't use particle tracks for that. Create Gif images of every stage and then use gifsicle to create a animation.

http://www.lcdf.org/gifsicle/
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Old   February 24, 2010, 05:01
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Adil Eshack
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Sir,
Can u just tell me in brief of ur fluent setup. What all boundary conditions you took and how u viewed the results..did you use multiphase model??
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Old   February 24, 2010, 05:28
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Ganapathy Iyer
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You have solved the case.
Now Create a Plane and plot the contours of volume_Fraction of any one phase.
At each time step, take a GIF image of the same. You can write a function in the Solve/ Execute Commands tab to save a GIF image at every time step.

Once you have all these GIF images, (say for 100 time steps, you have 100 images) You can merge all these images and create a animated GIF using gifsicle.
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Old   February 24, 2010, 05:53
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If you want to creat Animation in fluent,

just change the set up and write it as Mpeg file.

so simple
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Old   February 24, 2010, 10:39
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i know how to do an animation.

i already made this transient simulation and i can observe the dispertion of the gas using the particle tracks.
i have made too a simulation with the contours of the velocity magnitude.

the simulated environement is this:



how can i make an animation with the contours of the concentration of the gas in this 2D environment ?
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Old   March 2, 2010, 10:03
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the solution to this problem is make a simulation with species transport deactivating the reactions between mixture of these two gases (methane-air).

then i made an animation and created harcopy frames with TIFF images and with QuickTime open the sequence of images and created a video .mov or exported a .avi
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