VNAT stack effect without temperature gradient - unexpected behaviour

VNAT stack effect without temperature gradient - unexpected behaviour

matthieu.griveletAH26V
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VNAT stack effect without temperature gradient - unexpected behaviour

matthieu.griveletAH26V
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Hello there,

I've been doing a series of simulations on a building releasing heat in the middle of calm air - 0Pa gage pressure BCs.

Everything went almost well for several variants but when I changed my outside temperature from 24C to 33C, I suddenly have high air speeds directly going from my 'inlets' to my 'outlet' BCs, even though the temperature gradient is 0.

Anyone has an idea why ?

Thank you all, have a great day !

matthieugriveletAH26V_0-1730216699061.png

PS: I tried to share the CFZ support file but it was not allowed by the forum.

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