Step 9: Iterate for Higher Pixels

1.   Increase pixelation for accuracy.

Models Radiation Edit...

  For semi-transparent and reflective surfaces, increasing accuracy by increasing pixilation is more efficient than increasing theta and phi divisions.

(a)   Set both Theta Pixels and Phi Pixels to 2.

(b)   Click OK to close the Radiation Model dialog box.

2.   Request 1000 more iterations.

Run Calculation

  The solution will converge in approximately 100 additional iterations.

3.   Save the case and data files ( do_2x2_2x2_pix.cas.gz and do_2x2_2x2_pix.dat.gz).

File $\rightarrow$ Write $\rightarrow$ Case & Data...

4.   Display temperature profile for the lens-inner.

Plots XY Plot Set Up...

(a)   Disable Write to File.

(b)   Retain the default settings and plot the temperature profile.

(c)   Enable Write to File and click the Write... button to open the Select File dialog box.

i.   Enter do_2x2_2x2_pix.xy for XY File and close the Select File dialog box.

(d)   Click the Load File... button to open the Select File dialog box.

i.   Select do_2x2_1x1.xy and click OK to close the Select File dialog box.

(e)   Click the Curves... button to open Curves - Solution XY Plot dialog box.

i.   Set Curve # to 1.

ii.   Select the line pattern as shown in the Curves - Solution XY Plot dialog box.

iii.   Select the symbol pattern as shown in the Curves - Solution XY Plot dialog box.

iv.   Click Apply and close the Curves - Solution XY Plot dialog box.

(f)   Disable Write to File.

(g)   Click Plot (Figure  6.7).

Figure 6.7: Temperature Profile for lens-inner

(h)   Close the Solution XY Plot dialog box.

5.   Increase both Theta Pixels and Phi Pixels to 3 and continue iterations.

Models Radiation Edit...

6.   Click the Calculate button.

Run Calculation

  The solution will converge in approximately 100 additional iterations.

7.   Save the case and data files ( do_2x2_3x3_pix.cas.gz and do_2x2_3x3_pix.dat.gz).

File $\rightarrow$ Write $\rightarrow$ Case & Data...

8.   Display temperature profile for the lens-inner.

Plots XY Plot Set Up...

(a)   Make sure Write to File is disabled.

(b)   Ensure that all files are deselected from the File Data selection list.

(c)   Ensure that lens-inner is selected from the Surfaces selection list.

(d)   Click Plot.

(e)   Click Write to File and save the file as do_2x2_3x3_pix.xy.

9.   Repeat the procedure for 10 Theta Pixels and Phi Pixels and save the case and data files ( do_2x2_10x10_pix.cas.gz and do_2x2_10x10_pix.dat.gz).

(a)   Save the file as do_2x2_10x10_pix.xy.

10.   Read in all the files and plot them.

Plots XY Plot Set Up...

(a)   Click the Load File... button to open the Select File dialog box.

i.   Select all the xy files and close the Select File dialog box.

Note:   Selected files will be listed in the XY File(s) selection list.

   Make sure you deselect lens-inner from the Surfaces list so that there is no duplicated plot.

(b)   Click the Curves... button to open Curves - Solution XY Plot dialog box.

   Make sure you deselect lens-inner from the Surfaces list so that there is no duplicated plot.

i.   Select the line pattern as shown in the Curves - Solution XY Plot dialog box.

ii.   Select the symbol pattern as shown in the Curves - Solution XY Plot dialog box.

iii.   Click Apply to save the settings for curve zero.

iv.   Set Curve # to 1.

v.   Follow the above instructions for curves 2, 3, and 4.

vi.   Click Apply and close the Curves - Solution XY Plot dialog box.

(c)   Click Plot (Figure  6.8).

(d)   Close the Solution XY Plot dialog box.

Figure 6.8: Temperature Profile

Note:   The keys in this plot are changed for better comparison. You may ignore this and proceed further.