CFD Simulation of a Flu Virus Spread in a FLight Cabin
 

Hello everyone, I am fairly new to this site and Ansys.

After looking around the web for a while i have realized that this is by far the best site for cfd users. Congrats to Admins Mods and ofcourse Users without whom this would be not around.

I have a few questions regarding a project that i am working on.

1) Trying to build a flight cabin with 3 seats in each row of 3 rows.
(right now i am building it in Catia V5R19, as i dont know how to do it in Gambit) (Please give me in ur input in which one i should build my model in Catia or Gambit?)

2) The cabin does not have requirements for material however it will be a floor with 4 sorrounding walls and the ceiling will be slightly curved like a Flight Cabin. The ceiling will have three holes on top of each row of chairs (i.e. inlet of air-conditioner) Thus total of 9 inlets for total of 9 chairs.

After i make the mesh, i need to use fluent to solve for flow.

I have roughly 20 days to make the model and mesh in gambit do you think that is enough time to do that as i am not exactly familiar with this at all.

3) If i make the assembely in Catia, what should i look out for so that i have to encounter minimum problems in importing the model to gambit to mesh.

Appreciate everyone's help, Please do respond as this is a group a project but sadly http://www.cfd-online.com/Forums/ans...lies/frown.gif i have to work on it myself as my groupmates are kind of useless.

I have given myself a GOAL to Finish Model and MESH by 22nd of January 2010.

I think the first and most important questions is: How familiar are you with using CATIA? Creating a simple mesh in gambit will be straight forward after you create the surfaces from the wire mesh you import.
Secondly how are you going to validate your results, what is the quantity of infectious particles you are going to use?

Thanks KingJewel
 

Thanks buddy for replying.

Sorry i dont know whats a wire mesh I have not used gambit yet.

Validatidating my results : I have not looked into average contanimant caughed out if someone is infected. or a sneezy. I will userough estimates of this, like i said i have not looked into this but am just making a guess.

Again there will be 9 seats like i said 3 rows of 3 chairs. So i will look to simulate maybe 4 different situations, Full aircraft (9 Pasengers), Relatively full(6 to 7 Passengers), Half (4 to 5 Passengers), And failry empty (3 Passengers).

It is quite obvious that all of the passengers are not sick, so just take a random guess and try different simulations.

I hope that answers your queries. I am not sure if i am right, please feel free to give your input as you definately know more than wht i am talking about.

But the problem is the model I cant figure out how to make the model of a room with Floor, 4 Sorrounding walls and Ceiling is Curved like an aircraft. And then 3 rows of 3 chairs on the floor.

I was just trying to make it in catia and i encountered error saying over contrained, I was using Coincidence contrains to connect parts.

As before I extruded but then after tht i could not look into the box, It became a solid Part once i covered the Ceiling :(

Here are a couple of papers you might find useful.

Comparison of the Eulerian and Lagrangian methods for
predicting particle transport in enclosed spaces
Z. Zhang, Q. Chen

Experimental study of ventilation effectiveness and air velocity
distribution in an aircraft cabin mockup
Aijun Wang, Yuanhui Zhang, Yigang Sun, Xinlei Wang

Model
 

Thanks, I have a Project from a Q. Chen aswell I am attaching that photograph of the layout of the cabin i want, but not as big as the photograph indicates, only 9 chairs, just the center section.

the Image if from this project

Influence of cabin conditions on placement and response of

contaminant detection sensors in a commercial aircraft (Qingyan Chen, Ph.D. &
Sagnik Mazumdar)

I haven't used CATIA myself but if you know the individual coordinates of every vertex in your design then GAMBIT would be simple enough to use. Hence you avoid problems with importing the geometry into it. But having said that if you have ICEM, that would be a better future prospect for you.
Gambit is obsolete now after ANSYS12.
Of course this is not the only way to go about modelling the domain.

So are you going to use multiphase simulations with CO2 as the transport medium for the pathogens?

Please check my edited post.

I dont know what you mean by your question. And also by the every vertex and individual coordinates. I amsorry you have lost me a bit.

Yes i am aware that after ansys 12 there i sno more gambit however in our uni thats what we have on computers, I downloaded ansys 12 but i codul not get it to work due to licencing issues.

Answer
 

hi Dear
for quick answers it is better for you to attach your geometry plan on your request.
However, I think for your complicated geometry CATIA is a good choice to create, and GAMBIT is very good for meshing. But just notice when you want to Import anything to GAMBIT, you have to change some tolerances and also you must use Low and High level operations of Virtual geometry, for further information refer to: http://www.ent.ohiou.edu/~juwt/HTMLS/fluent/gambit2/html/modeling_guide/mg0a.htm
and also: http://www.ent.ohiou.edu/~juwt/HTMLS/fluent/gambit2/html/tutorial_guide/tg05.htm
be successful.

Need Help
 

Thanks for your reply.

Please look below for the photograph whihc is similar to what i want to achieve in catia or gambit.

However my model will only consist of the center sections of 3 rows of 3 chairs in each row.

I am trying to do this in Catia Part design. First extrude the base then extrude the walls from the base. And similar way for the chairs and then the ceiling...But catia gives me an error saying this operation is unessecary.

Also when i have the finished part it becomes a solid and i am unable to look inside...When i zoom in it does not allow me to go through walls into the empty space in the cabin. It just becomes a solid part which i cannot look into.

I am making it in Part design by simply extrusion, do you have any input on how may i go about doing this I have been trying for very long but have been unable to to get anywhere.

I am also attaching a print screen of a model tht i am working on right nowwhihc i highly doubt is gonna work. Please also refer to the expanded tree on the side.

Catia to Gambit
 

Thanks to everyone who helped with my previous issue.

Great news I have some Progress about 30 %.

My Project is CFX Simulationof a Flu Virus SPread in a Flight Cabin.

1) I think I have been Successfully been able to construct a Model in Catia V5 R19 that will work in Gambit.

2) I have uploaded my Model Here in Rapidshare, This site ha s alimit of 100KB Where my CatPart is around 600KB.

(This Model is not to scale, As i am not familiar to catia so i decided to make a rough one and see if i am in the Right direction.) I used The Boolean Add Feature to Join Separate Bodies Together into one Single PartBody.

http://rapidshare.com/files/33125038...n.CATPart.html
(There are holes on ceiling, 9 of them in total, which correspond to 9 inlets of AirCon for 9 Seats)

I dont have access to Gambit, If anyone could check my Model and give me there input that weather I am on the right Track.

I honestly have no idea, Any feedback is welcome.