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blockMeshDict in Sandia_LTS combustion/reactingFoam/RAS tutorial

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Old   January 28, 2021, 14:12
Default blockMeshDict in Sandia_LTS combustion/reactingFoam/RAS tutorial
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Domenico Lahaye
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I have a doubt on the blockMeshDict to define the geometry in the Sandia_LTS combustion/reactingFoam/RAS tutorial.

The blockMeshDict file is here: https://github.com/OpenFOAM/OpenFOAM.../blockMeshDict

My question is as follows:

The inletPilot faces is defined as (5 3 4 6) (line 110)

The second of the wallTube patches is defined as (10 11 9 8) (line 99)

On both faces the outward normal is in the negative z-direction. The nodes of both faces are traversed in opposite direction.

Why is this? Thx.
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Old   January 29, 2021, 10:03
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Petros Ampatzidis
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Hi Domenico,

From a quick look it seems that face's (5 3 4 6) normal is towards the negative z-direction whereas the one of face (10 11 9 8) is towards the positive z-direction. I hope I am not misreading the blockMeshDict.

Best,
Petros
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Old   January 29, 2021, 14:44
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Domenico Lahaye
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Dear Petros,

Sincere thanks.

I fail however to understand why on face (10 11 9 8) the normal is towards the positive z-direction.

Could you pls. elaborate?

Greetings, Domenico.
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Old   January 29, 2021, 16:40
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Petros Ampatzidis
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Hi Domenico,

Sorry for being misunderstood. When I said that the normal of face (10 11 9 8) points in the positive direction I was refering to the one that matches the order in which its vertices are traversed in the tutorial. I agree that since face (10 11 9 8) belongs to block (8 10 11 9 17 19 20 18) I would traverse its vertices as (10 8 9 11).

I think I have encountered similar mis-orientated faces. If I remember correctly blockMesh gives a fatal error only when all faces of a block are pointing inwards.

The question is what really happens if one or two faces are pointing inwards and how that affects calculations. I am not sure about it so I hope some more experienced users can shed some light.

Best,
Petros
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Old   January 31, 2021, 08:24
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Domenico Lahaye
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Dear Petros,

Thank you for sharing your thoughts.

It is wonderful to hear that my doubts on the issue are shared by you.

I will seek further support.

Thanks again, Domenico.
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