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[mutianzi1]

Hello All,

 

I was using Fluent to simulate a wind field associated with a complex terrain. At the velocity inlet, profile was used as the Y-velocity input, which is shown as below. In this case, the absolute coordinates are used in the velocity profile, and the velocities at the locations with the same absolute z-coordinates are the same, but different with equal distance from the curvy ground.

 

My question is how to define the velocity profile using coordinates in relative to the curvy ground, that is, z-coordinates is the height in relative to the curvy ground, not the absolute height. In this way, the velocity at equal distance from the ground would be the same. An illustration of absolute and relative coordinates are also presented below.

 

Thank you very much. Any help is appreciated.

 

Merry Christmas!

The definition of Y-velocity at velocity inlet

[Konstantin]

Fluent operates in global Cartesian coordinates, and the profile will need to be recast in global coordinates to correspond to the relative coordinate. Knowing the ground level, you should be able to calculate what absolute z should be for each point so that delta z between the ground and the pint is the same for all the points.n

[mutianzi1]

Fluent operates in global Cartesian coordinates, and the profile will need to be recast in global coordinates to correspond to the relative coordinate. Knowing the ground level, you should be able to calculate what absolute z should be for each point so that delta z between the ground and the pint is the same for all the points./forum/discussion/comment/101292#Comment_101292

Hello kkourbat,nnThank you for your clarification. Appreciated.n