Quantities at Certain Depth

[FDS_user]

Hi,

From user's guide I got this:

"To record the temperature inside the surface, you can use a device as follows:
&DEVC XYZ=..., QUANTITY='INSIDE WALL TEMPERATURE', DEPTH=0.005, ID='Temp_1', IOR=3 /"

I have a solid obstruction of which one x-face is along x=+2m (another -x face at 1.9m) and the obstruction is one cell thick for heat conduction. It is also having material surface on both sides of x direction having thickness of 0.05m (cell size is 0.1m). So, if I want to measure at 0.025 from x=+2m inwards (towards -x direction) in my DEVC as DEVC XYZ=2,y,z and depth as DEPTH= 0.025 to measure correctly ?

I presume that here the DEPTH is measured from +x surface and it takes into account the material thickness.

Thanks.

[Kevin McGrattan]

DEPTH in this case means 5 mm inside the solid. The face of the solid must have a SURF_ID that describes a thermally-thick material. The DEPTH is based on the SURF THICKNESS.

[FDS_user]

Thanks, now it is clear to me.

[Alex V]

Greetings,

I have set up the following test configuration: Above the fire, there is a concrete block with a height of 0.1 m (equivalent to 1 cell) specified in the OBST line. In the SURF description, the block is defined with a thickness of 0.5 m:
&MATL ID='CONCRETE', SPECIFIC_HEAT=1.04, CONDUCTIVITY=1.8, DENSITY=2280.0 /
&SURF ID='WALL', BACKING='VOID', MATL_ID(1,1)='CONCRETE', MATL_MASS_FRACTION(1,1)=1.0, THICKNESS(1)=0.5 /



If I intend to measure the temperature 4 cm inside the block from the surface that is being heated by the fire, would the code line be correctly formulated as follows?

&DEVC ID='T1', XYZ=0.0,0.0,2.04, QUANTITY='INSIDE WALL TEMPERATURE', DEPTH=0.04, IOR=-3 /

Thanks.

вторник, 8 июня 2021 г. в 17:17:44 UTC+2, FDS_user:

[dr_jfloyd]

In XYZ(), the Z value should be the face of the solid (2.0) not the in-depth location (2.04).