Rectangular box with round inlet in 2D?

Flow_Newbie · January 15, 2020, 04:25

Hi,

until now, i´ve done durability and stiffness simulations, so CFD is new to me.
Now i have to do a 2D simulation of a rectangular box with an internal round velocity inlet (see attached graphic). The pipe of the inlet can be ignored in the simulation.
So if you look from the side in 2D, there is just an edge left for the inlet. So far so good. But in my opinion this problem could not be solved in 2D, because there are not uniform shapes in the depth, because of the rectangular form of the box. Or how should i set up this problem?

Thanks a lot and greetings,
Flow_Newbie

LuckyTran · January 15, 2020, 17:20

What is your objective?

Both pictures are simulate-able (sort of) and you'll be able to infer different things. I say sort of, because you have an inlet but no outlet... You might want to fix that first.

Flow_Newbie · January 15, 2020, 18:35

The objective is to show the velocity distribution in y-direction. The picture is just a simple sketch, in the real model there is a pressure outlet in the middle of the box bottom.
I've already simulated this problem, with the simple solver and the k-epsilon turbulence Modell. My problem is, that I don't think that the results are correct. In 3D can the air circulate around the nozzle in all directions and dimensions. But in 2D there is no depth (just the 1m per default) or everything has the same depth, also box and nozzle. That would mean that the nozzle go through the whole way from the front to the back of the virtual depth?! But in real that is not the fact, the nozzle is just a small circle in the middle of the box. How can I get anyway the right velocity distribution?

I hope my problem and my thoughts are understandable.

LuckyTran · January 16, 2020, 10:04

Well a 2D model isn't a 3D model. That's why I ask what is the objective.

You can infer a lot of things still, depends on what your goal is. If you think it's wrong, then do a 3D one.

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January 15, 2020, 17:20		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	What is your objective? Both pictures are simulate-able (sort of) and you'll be able to infer different things. I say sort of, because you have an inlet but no outlet... You might want to fix that first.

January 15, 2020, 18:35		#3
Flow_Newbie New Member Join Date: Jan 2020 Posts: 2 Rep Power: 0	The objective is to show the velocity distribution in y-direction. The picture is just a simple sketch, in the real model there is a pressure outlet in the middle of the box bottom. I've already simulated this problem, with the simple solver and the k-epsilon turbulence Modell. My problem is, that I don't think that the results are correct. In 3D can the air circulate around the nozzle in all directions and dimensions. But in 2D there is no depth (just the 1m per default) or everything has the same depth, also box and nozzle. That would mean that the nozzle go through the whole way from the front to the back of the virtual depth?! But in real that is not the fact, the nozzle is just a small circle in the middle of the box. How can I get anyway the right velocity distribution? I hope my problem and my thoughts are understandable.

January 16, 2020, 10:04		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	Well a 2D model isn't a 3D model. That's why I ask what is the objective. You can infer a lot of things still, depends on what your goal is. If you think it's wrong, then do a 3D one.