Learning Forum

[5007221094]

I ran a simple external flow simulation across an object, but I can't get the velocity contour on the object's surface; it's always showing zero.

I know that I'm running this simulation with a no-slip boundary condition, which, in theory, should result in zero velocity on the surface. However, this didn't seem to happen in my previous version of Ansys. Even when the simulation was run with a no-slip wall condition, I could still view the surface velocity contour in Fluent Post and CFD-Post.

Currently, I can only view the velocity contour in Fluent Post by checking the "Node Values" option, but I can't seem to find that checkbox in CFD-Post. In my previous version of Ansys, I could view the velocity contour on a no-slip wall surface regardless of which value type was selected.

Please help me. 🙂

 

 

 

[Essence]

Hello,

May I please know the versions in which you were getting the non-zero and zero velocities at the surface?

[5007221094]

I am using the Ansys 2025 R2 student version, the version in the provided picture. I was previously using the 2024 R1 version. At first the velocity contour was working fine, but then this problem started.

I changed to the newer version, thinking it would solve the issue. I even did a fresh install of windows and reinstalled 2025 R2.

Whenever I try to run a simulation completely on my device, from geometry to results with fluent meshing, the velocity contour does not show.

However, when I import a case file (.h5) that has already been run on another device, the velocity contour appears (both on the boundary values and in CFD-Post). The contour still appears even if I only open the case, delete the existing simulation data, re-initialize, and re-run the simulation.

When I import only the mesh from that same simulation and set up the physics exactly as they were, the velocity contour fails to appear again.

[Petros]

For CFD-Post you need to use the Conservative values in the contour in order to see velocity values "on" the wall.