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27.7. Multi-Shot Ice Accretion with Automatic Mesh Displacement – Postprocessing Using CFD-Post

In this tutorial, you will learn how to quickly post-process and generate figures and animations of a multishot ice accretion simulation (ice shape and ice solution fields) using two dedicated CFD-Post macros: Ice Cover – 3D-View and Ice Cover – 2D-Plot. For this purpose, the multishot icing solution of Multi-Shot Ice Accretion with Automatic Mesh Displacement (p. 925) is used and, therefore, completion of Multi-Shot Ice Accretion with Automatic Mesh Displacement (p. 925) is required.

For more information regarding these macros, consult CFD-Post Macros within the FENSAP-ICE User Manual.

1.Inside your Fluent Icing window, go to Ribbon menu and select View. In Quick-view, click Ice cover → Multishot -ice cover – CFD-Post.

2.After opening CFD-Post, a Domain Selector window will request confirmation to load the following domains: ice swimsol, map grid, and map swimsol. Click OK to proceed.

3.Go to the Calculators tab and double-click on Macro Calculator. The Macro Calculator’s interface panel will be activated and displayed.

Note

The Macro Calculator can also be accessed by selecting Tools → Macro Calculator from the CFD-Post’s main menu.

4.Select the Ice Cover – 3D-View macro script from the Macro drop-down list. This will bring up the user interface which contains all input parameters required to view ICE3D output solutions in the CFD-Post 3D Viewer.

5.The default settings inside the Macro Calculator panel will allow you to automatically output the ice shape of the first shot of the multishot simulation. Output the ice shape at the end of the multishot simulation

of Multi-Shot Ice Accretion with Automatic Mesh Displacement (p. 925), this corresponds to the ice shape

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of shot 3, by specifying 3 besides the MultiShot Num and then by clicking Calculate. The figure below shows the output the final ice shape.

Figure 27.29: Ice View in CFD-Post, Final Ice Shape

Note

To change the style of the ice shape display, go to Display Mode and select one of following options: Ice Cover, Ice Cover – Shaded, Ice Cover (only) or Ice Cover (only) - shaded. To output the surface mesh of the ice shape, go to Display Mesh and select

Yes.

6.To display the solution fields of your icing simulation, you can either select Ice Solution – Overlay, Ice Solution or Surface Solution under Display Mode. In this case, you will output the ice accretion rate over the ice layer of the 3rd shot. To do this, select Ice Solution – Overlay in Display Mode, Instant. Ice Growth (kg s^-1 m^-2) in Display Variable and No in Display Mesh to turn off the displaying surface mesh.

7.Click Calculate to view the instantaneous ice growth over the ice shape. The figure below shows the output of the macro.

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Figure 27.30: Ice View in CFD-Post, Instantaneous Ice Growth over Ice Cover Surface, Final Ice Shape

8.You can also generate and save animations that highlight the ice shape evolution of your multishot simulation. Follow these steps to create and save a custom animation.

•Set MultiShot Num. to 1. The animation starts at the assigned shot number in MultiShot Num. to the last shot of the simulation.

•Set (Multishot) Movie to On and click Calculate to see the animation on the 3D Viewer window.

•To save this animation, in (Mulitshot) Movie,

–Set Save to Yes.

–Select an export Format. Two formats are supported, WMV and MPEG4. The default is WMV.

–Specify a Filename.

•Click Calculate to generate and save the animation. A message will appear to notify the user of the location where the animation is saved and of the first shot used to generate the animation.

Note

If CFD-Post was opened using Fluent Icing, the animation will be saved in your working directory. If CFD-Post was opened in standalone mode, the animation will be saved in the Window’s system default folder.

9.Select Ice Cover – 2D-Plot from the Macro drop-down list to create 2D-plots of the multishot simulation. You will create a 2D-Plot that contains all the ice shapes generated by the multishot simulation.

10.Make sure that MultiShot Num. is set to 1.

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11.Change Plot’s Title from default, ICE SHAPE PLOT, to Multishot Ice Shape at -7.5 C (3 shots).

12.Select Multi-Shots in 2D-Plot (with). The macro will generate a series of 2D plot curves, starting from the assigned shot number in MultiShot Num. to the last shot of the simulation.

13.Inside 2D-Plot (with),

• Set Mode to Geometry to output an ice shape. The other options output the ice solution fields.

•Set Cutting Plane to Z plane. Specify a Z=0 plane by setting X/Y/Z Plane to 0.

•Set the X-Axis to X and the Y-Axis to Y.

14.To center the 2D-Plot around the leading edge of the NACA0012, in 2D-Plot (with),

•Change the (x)Range of the X-Axis from Global to User Specified. Specify values of 0.06 and -0.025 in the input boxes of (Usr.Specif.x)Max and (Usr.Specif.x)Min, respectively.

•Change the (y)Range of the Y-Axis from Global to User Specified. Specify values of 0.025 and -0.035 in the input boxes of (Usr.Specif.y)Max and (Usr.Specif.y)Min, respectively.

15.Leave the other default settings unchanged and click Calculate to create a 2D-Plot of the multiple ice shapes in a floating ChartViewer of CFD-Post. Adjust the output window’s size. The figure below shows the output of the macro.

Figure 27.31: 2D-Plot in CFD-Post, Ice Shapes of the Multishot Simulation

Note

To create 2D plots of the ice solution fields, go to 2D-Plot (with) → Mode and select either Solution (on Ice Surfaces) or Solution (on Map Surfaces). Then go to 2D-Plot (with) → Y-Axis and select the ice solution field of interest. Specify a (x)Range and a

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(y)Range that are suitable. Click Calculate to output the 2D-Plot of the ice solution field in a floating ChartViewer.

16.The 2D-Plot macro can also export all plotted curves to a CSV format file and simultaneously save the plot as a figure. Keep all input parameters above unchanged and follow these steps.

•To export all plotted curves to a .CSV file, set Export (to csv) to Yes and specify a file name under Filename (csv).

•To save a figure of the 2D-Plot, set Save Figure to Yes, select a Format for the figure (PNG or BMP) and specify a Filename to save the figure.

•Click Calculate to generate the 2D plot, export all data points to a .CSV file and save the plot into a figure file. A message will appear to notify the user of the location where the .CSV and figure file are saved.

Note

If CFD-Post was opened using Fluent Icing, both the CSV and figure files will be saved in the working directory. If CFD-Post was opened in standalone mode, both files will be saved in the Windows’ system default folder.

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