Mass flow at vents

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Matthew Bilson

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Oct 18, 2021, 10:08:40 AM10/18/21
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Hi - I am trying to monitor mass flow in and out of my domain, see example below. Recent nightly release (FDS6.7.6-776-gea28f1b9f-nightly) giving 0.0 for mass and volume flow at the inlet. Previous versions did not do this. Outlet side flows are ok.

&HEAD CHID='Ex',TITLE='Ex' /
&MESH IJK=100,22,20,XB=-20.0,20.0,-4.4,4.4,0.0,8.0 / 
&VENT XB=-20.0,-20.0,-4.4,4.4,0.0,8.0,SURF_ID='INVENT' /
&SURF ID='INVENT',VEL=-3.00,RGB=100,20,20 / 
&VENT XB=20.0,20.0,-4.4,4.4,0.0,8.0,SURF_ID='OPEN' /
&TIME T_END=90.0 /
&DEVC XB=-20.0,-20.0,-4.4,4.4,0.0,8.0,QUANTITY='MASS FLOW WALL', IOR=1, ID='MASS FLOW in' /
&DEVC XB=-20.0,-20.0,-4.4,4.4,0.0,8.0,QUANTITY='VOLUME FLOW WALL', IOR=1, ID='VOLUME FLOW in'/
&DEVC XB=20.0,20.0,-4.4,4.4,0.0,8.0,QUANTITY='MASS FLOW WALL', IOR=-1, ID='MASS FLOW out' /
&DEVC XB=20.0,20.0,-4.4,4.4,0.0,8.0,QUANTITY='VOLUME FLOW WALL', IOR=-1, ID='VOLUME FLOW out' /

Kevin McGrattan

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Oct 19, 2021, 4:50:39 PM10/19/21
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