Post Processing Results: Ansys Workbench 18.2 - Fluent - CFD Post - Porous Body
 

Hi,

Apologies if this type of query was addressed. Couldn't find in the search

I am new to ANSYS and trying hands at Fluent and CFD Post.

Working on ANSYS Workbench 18.2, have a question on how the CFD Post processes the results of the runs performed in FLUENT.

Have shown a simple case in the image file attached.

What we have in here is inlets from 2 sides (P static = 0 ), a porous body ( coefficients attached from experimental data, viscous and inertial resistances) and and one outlet ( mass outflow ) on the top.

Air enters from 2 inlets, turn 90 degrees, enter the porous body and then from the exit side of the porous body, will move towards the outlet.

Model is fully converged and mass balance is correct.

When the data is postprocessed in CFD Post to understand the velocity field on the inlet to the porous body, noticed two variations of plots.

The top velocity plot in the attached image is the velocity plot on the inlet surface of the porous body

Bottom velocity plot is a velocity plot at 0.1 inch in front of the inlet surface of porous body

Herein is my confusion.

As soon as the plane of velocity plot is moved away from the inlet surface of porous body, there is a an order of magnitude change in velocity ?

Is it realistic ?

Are we plotting the velocity correctly at different locations ?

Any help or guidance would be of great help