Calculation on a Launch Pad

aerolrion · November 26, 2024, 13:10

I am working on a project about launch pads. I wanna make CFD analysis with the help of SU2. In my project, I want to analyze flow which starts from nozzle exit by not analyzing nozzle's inside as you can see in the image. How can I make it on SU2?

bigfootedrockmidget · November 26, 2024, 14:19

You did not give a lot of details so it's difficult to say. Do you already have the mesh and do you already know the boundary conditions? What are they? Is this a steady flow? I would start with the inviscid wedge tutorial and replace that setup with your mesh. Let us know how that works out!

aerolrion · November 26, 2024, 15:00

I have a mesh that resolves a nozzle to achieve the shock diamonds in the picture. The flow is unsteady. There are not much data given in the reference paper so what we do is try to validate our inputs by trial and error. Solving inside the nozzle takes more time and since we don't know the exact parameters it's difficult to obtain exact results. If I can select an exit Mach or something like that to obtain a similar solution of the aforementioned picture that would be a great help.

Thank you for your time and answer.

bigfootedrockmidget · November 26, 2024, 15:47

Well, what comes out of the nozzle is already an interacting shockwave pattern, so either you need to give a boundary condition at the nozzle exit that reproduces that exactly, or you need to take into account the interior of the nozzle.
You could try to create an inlet profile for it, or simply have an open interior and place the inlet inside the nozzle.

aerolrion · November 27, 2024, 02:22

I don't want to solve the nozzle inside, what boundary conditions can I get for this at the exit?

bigfootedrockmidget · November 27, 2024, 05:14

you could try

Code:

SPECIFIED_INLET_PROFILE = YES
INLET_FILENAME = inlet.dat

and the first time that you run it, it will give you a default inlet profile file that you can edit yourself. Actually, I am not sure if it works for supersonic inlets, I did not see an example testcase for it. So just give it a try.

EvertBunschoten · November 27, 2024, 11:32

Regarding the outlet, you can just set a static pressure outlet with the static pressure at ambient.

aerolrion · November 27, 2024, 15:11

Thank you for your responses, I'll try these.

November 27, 2024, 05:14		#6
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 773 Rep Power: 21	you could try Code: SPECIFIED_INLET_PROFILE = YES INLET_FILENAME = inlet.dat and the first time that you run it, it will give you a default inlet profile file that you can edit yourself. Actually, I am not sure if it works for supersonic inlets, I did not see an example testcase for it. So just give it a try.

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November 26, 2024, 14:19		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 773 Rep Power: 21	You did not give a lot of details so it's difficult to say. Do you already have the mesh and do you already know the boundary conditions? What are they? Is this a steady flow? I would start with the inviscid wedge tutorial and replace that setup with your mesh. Let us know how that works out!

November 26, 2024, 15:00		#3
aerolrion New Member aerolrion Join Date: Nov 2024 Posts: 4 Rep Power: 2	I have a mesh that resolves a nozzle to achieve the shock diamonds in the picture. The flow is unsteady. There are not much data given in the reference paper so what we do is try to validate our inputs by trial and error. Solving inside the nozzle takes more time and since we don't know the exact parameters it's difficult to obtain exact results. If I can select an exit Mach or something like that to obtain a similar solution of the aforementioned picture that would be a great help. Thank you for your time and answer.

November 26, 2024, 15:47		#4
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 773 Rep Power: 21	Well, what comes out of the nozzle is already an interacting shockwave pattern, so either you need to give a boundary condition at the nozzle exit that reproduces that exactly, or you need to take into account the interior of the nozzle. You could try to create an inlet profile for it, or simply have an open interior and place the inlet inside the nozzle.

November 27, 2024, 02:22		#5
aerolrion New Member aerolrion Join Date: Nov 2024 Posts: 4 Rep Power: 2	I don't want to solve the nozzle inside, what boundary conditions can I get for this at the exit?

November 27, 2024, 11:32		#7
EvertBunschoten New Member Evert Bunschoten Join Date: Nov 2024 Location: Netherlands Posts: 11 Rep Power: 2	Regarding the outlet, you can just set a static pressure outlet with the static pressure at ambient.

November 27, 2024, 15:11		#8
aerolrion New Member aerolrion Join Date: Nov 2024 Posts: 4 Rep Power: 2	Thank you for your responses, I'll try these.