User defined or Spatially-Dependent Temparature Profiles

[appheadspace]

Hi, I'm studying natural convection in 2D cavity with a isothermal vertical walls and insulated horizontal walls. Due to some practical reasons, horizontal walls are not perfectly insulated. So, temp values are measured during experiment and given at some spatial intervals. I've tried "11.3 Spatially-Dependent Velocity Profiles" approach with RAMP_T, but it is not working (showing temp =0 for horizontal walls instead of given temp distribution. Kindly help !

I've tried this:

&SURF ID='top_wall', RAMP_T='top_temp_ramp' /
&RAMP ID='top_temp_ramp', T=0.0, F=50.0 /
&RAMP ID='top_temp_ramp', T=0.00067, F=47.15 /
&RAMP ID='top_temp_ramp', T=0.0133, F=45.53 /
&RAMP ID='top_temp_ramp', T=0.0533, F=43.92 /
&RAMP ID='top_temp_ramp', T=0.20, F=41.59 /
&RAMP ID='top_temp_ramp', T=0.40, F=39.06 /
&RAMP ID='top_temp_ramp', T=0.60, F=36.67 /
&RAMP ID='top_temp_ramp', T=0.80, F=34.17 /
&RAMP ID='top_temp_ramp', T=0.90, F=32.45 /
&RAMP ID='top_temp_ramp', T=0.95, F=31.04 /
&RAMP ID='top_temp_ramp', T=0.99, F=29.71 /
&RAMP ID='top_temp_ramp', T=1.0, F=25.0 /

&SURF ID='bottom_wall', RAMP_T='bottom_temp_ramp' /
&RAMP ID='bottom_temp_ramp', T=0.0, F=50.0 /
&RAMP ID='bottom_temp_ramp', T=0.00067, F=46.91 /
&RAMP ID='bottom_temp_ramp', T=0.0133, F=45.15 /
&RAMP ID='bottom_temp_ramp', T=0.0533, F=41.82 /
&RAMP ID='bottom_temp_ramp', T=0.20, F=36.42 /
&RAMP ID='bottom_temp_ramp', T=0.40, F=30.92 /
&RAMP ID='bottom_temp_ramp', T=0.60, F=27.42 /
&RAMP ID='bottom_temp_ramp', T=0.80, F=24.09 /
&RAMP ID='bottom_temp_ramp', T=0.90, F=22.45 /
&RAMP ID='bottom_temp_ramp', T=0.95, F=21.26 /
&RAMP ID='bottom_temp_ramp', T=0.99, F=20.09 /
&RAMP ID='bottom_temp_ramp', T=1.0, F=20.0 /

&OBST XB=0.0,0.75,0.75,0.75,0.0,0.01, SURF_ID='top_wall' /
&OBST XB=0.0,0.75,0.0,0.0,0.0,0.01, SURF_ID='bottom_wall' /

[drjfloyd]

Please read the User's Guide. There are examples for doing just this.

[appheadspace]

Thanks for your reply! I've tried different approaches after seeing user guide only, but still not able to get temp distribution. Kindly help me.

[mcgratta]

This is not how a temperature ramp works.

&SURF ID='...', TMP_FRONT

[appheadspace]

Thank you for your reply!

Approach - 1:::

&OBST XB=0,0.750,-0.00005,0.00005,0,0 , SURF_ID='bottom_wall' /
&SURF ID = 'bottom_wall', COLOR = 'GRAY'/

&OBST XB =0,0,-0.00005,0.00005,0,0 ,SURF_ID='BW1'/
&SURF ID = 'BW1',TMP_FRONT =50/

&OBST XB =0.00015,0.00015,-0.00005,0.00005,0,0 ,SURF_ID='BW2'/
&SURF ID = 'BW2',TMP_FRONT =47.96/

&OBST XB =0.005025,0.005025,-0.00005,0.00005,0,0 ,SURF_ID='BW3'/
&SURF ID = 'BW3',TMP_FRONT =47.33/

Approach-2:::

&OBST XB=0,0.750,-0.00005,0.00005,0,0 , SURF_ID='bottom_wall' /
&SURF ID = 'bottom_wall', COLOR = 'GRAY', RAMP_T = Bottom_Temp_Ramp, TMP_FRONT = 30/

&RAMP ID='Bottom_Temp_Ramp', T=0, F=1.6667
&RAMP ID='Bottom_Temp_Ramp', T=0.00015, F=1.5987
&RAMP ID='Bottom_Temp_Ramp', T=0.005025, F=1.5777

I've tried both above approaches, but bottom wall temperatures are showing 30 at all locations. (PS: In my case INIT temp and TMPA , both are 30)

Kindly guide me.

[drjfloyd]