COSMOSFloExpress Question, Inlet/Outlet Conditions

[shift1313]

I know solidworks can do this but i am having some issues setting up flow boundary conditions. I have modeled a multi-plenum intake with one TB inlet and 8 outlets. 12runners total and 3 plenums.

 

My problem is setting up the outlet condition. It will let me select one runner for the outlet, the flow goes through all my plenums, everything has lids and the model produced no errors. But I would like to select all the outlets at once to see if any are "starving". When i view the fluid area it fills the entire volume of the intake and during the simulation air can get to all the runners.

 

Thanks for the help.

[shift1313]

I sort of answered my own question. i found a message that said COSMOSFloExpress will only analyze one inlet and one outlet. So is there another add-in that will do multiple outlets?

 

I think i managed to trick it but its still not what i am looking for.

 

thanks

[shift1313]

i did manage to trick the software by creating a large plenum(much larger than the manifold volume) and setting the bottom of this larger plenum as the outlet condition. This let air flow from my TB through the entire manifold. It worked once then when i started changing mass flow rate numbers and pressures my computer locks up every time it trys to solve it. If i ever get it to work again ill post a screen shot.

 

Still looking for an add on or info that will let you pick multiple outlets if anyone knows.

[shift1313]

I found the answer to my question. Cosmos Flow Express is like a watered down version of Cosmos Flow Works. Flow works will do internal/external flow(express will only do internal). Works can do multiple inlets/outlets. i wont list everything but basically a lot more! I have a price quote out right now to see what it costs to upgrade. here is a screen shot of something i made to trick flowexpress. Also im running a "wind tunnel" test on an external camera housing i made by creating a box around my part. The only issue with something like this is radiance. The flow can bounce off the box and not give me what i want. Make the box too large and you dont get the correct resolution. My comp has been crunching those numbers for awhile so hopefully they will be there tomorrow.

[Lazer]

looks really interesting, wonder how true to real life it is?

[shift1313]

well cosmos express does a good job of modeling single passages with internal flow, like a pipe, or a valve, or even a duct venting into one room. CosmosFlowWorks is a much better package that will model these things much better. So far the rest of the cosmos package has been very accurate with stress and force calculations. I can only assume its accurate for its intended purpose. I received several error messages once i pushed it too far by trying to trick it:)

[RWBennett]

I have a problem modeling cables and pulleys dynamically. I can use Inventor or SolidWorks. I've seen your various postings re similar topics. Can you direct me to some approaches?

[shift1313]

i have used sw to model a pulley/belt system or a cable system but not a timed or toothed system. There is a preloaded file/tutorial on using belts/pulleys in SW. Do you have that or only inventor? what do you need the model to do? i havent used Inventor to model a cable system and animate but i have used it to model something stationary.