Problem with Solving a Test case of Supersonic Combustion / Cold Flow

Sasi · August 17, 2023, 07:14

Hi everyone,

Greetings.

I am trying to simulate a cold flow (no combustion) test case on a step mixer geometry for supersonic flow visualisation using rhoCentralFoam.

I have tried different ways by changing the fvScheme and boundary patch names.

but the flow is not passing across the combustor.

it just reached the step and the simulations getting stopped with an error message appearing as " FOAM FATAL ERROR: Negative initial temperatures"

Kindly, please let me know, where could be the error, and what can be the reason. how to approach.. !

Thank you very much in advance..!

Please find the case file. Expected result vs my result

link for the case file: https://drive.google.com/file/d/1Ca-...ew?usp=sharing

my result.jpg

Expected result.jpg

Sasi · August 17, 2023, 23:07

Note, I have tried with OpenFOAM 7 version.

August 17, 2023, 07:14	Problem with Solving a Test case of Supersonic Combustion / Cold Flow	#1
Sasi New Member Sasi Kiran Join Date: Aug 2023 Location: Rome, Italy Posts: 2 Rep Power: 0	Hi everyone, Greetings. I am trying to simulate a cold flow (no combustion) test case on a step mixer geometry for supersonic flow visualisation using rhoCentralFoam. I have tried different ways by changing the fvScheme and boundary patch names. but the flow is not passing across the combustor. it just reached the step and the simulations getting stopped with an error message appearing as " FOAM FATAL ERROR: Negative initial temperatures" Kindly, please let me know, where could be the error, and what can be the reason. how to approach.. ! Thank you very much in advance..! Please find the case file. Expected result vs my result link for the case file: https://drive.google.com/file/d/1Ca-...ew?usp=sharing my result.jpg Expected result.jpg

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August 17, 2023, 23:07		#2
Sasi New Member Sasi Kiran Join Date: Aug 2023 Location: Rome, Italy Posts: 2 Rep Power: 0	Note, I have tried with OpenFOAM 7 version.