defining a plane as New Surface for a 2D geometry
I have a 2D model in Fluent, and I have calculated the model. In processing the data, I am interested in plotting the calculated results on a smaller window/plane rather than on the whole geometry. But I can not define a "plane" using defining "new surface". Please see the figure below: The green area is the 2D (axi-symmetric) geometry. The "plane" option is inactive. and I want to plot the results for a rectangle area similar to the red rectangle I draw on the geometry.