Error message in basic Flow Simulation [CFD analysis] NX7
Error message in basic Flow Simulation [CFD analysis] NX7
(OP)
Hey everyone,
So I'm trying to learn to do some basic CFD analysis using NX 7.0, specifically on internal flow in a test model of a 90 degree angled pipe. My process is as follows:
Which I fail to understand, as I added water as material in the mesh collector option when creating the Tetrehedal Mesh used for the simulation.
I also get this error in the report file:
Which I fail to comprehend for the same reasons.
Does anyone see where this error message stems from, and what I could do to rectify it?
I'd be happy to add additional informations and/or screenshots. For now I've attached the files I used and the error message in a .rar file.
Thanks in advance, and best regards!
Lars.
So I'm trying to learn to do some basic CFD analysis using NX 7.0, specifically on internal flow in a test model of a 90 degree angled pipe. My process is as follows:
- I open my part, pipe_test.prt
- Open advanced simulation environment
- Right click part in Simulation navigator and select "New FEM and simulation"
- Use standard parameters, I just change run directory in solve options to "Simulation-solution name" from "current simulation"
- Afterwards I go into the idealized file, and use Wave Geometry Linker, I then open up modelling environment and create the area of the internal pipe with Synchronous modelling and delete face. (I delete everything but internal faces and thus create a model of the flow area)
- I go back into Advanced Simulation environment, and enter the FEM file. I then suppress the body of the pipe, and am left with the body of internal flow area.
- I add a Tetrahedal Mesh (Tet10) with 5mm element size, and add water as material directly through the mesh collector option.
- I then go into the SIM file, and add two flow boundary conditions. Inlet flow (3000mm/s) through one face, and an opening condition through the other face. Illustrated with this picture
- I right-click solution 1 and hit solve. That's when I get the error messaged which I attached.
CODE -->
Mesh Error Summary ================== ERROR Mesh = 3d_mesh(1) Mesh has no material applied to it for thermal or flow calculation. Create a material and apply it to the mesh, the underlying geometry or the element attributes override.
Which I fail to understand, as I added water as material in the mesh collector option when creating the Tetrehedal Mesh used for the simulation.
I also get this error in the report file:
CODE -->
ERROR There are no 3D fluid elements or fluid mesh entity in model. Either create a 3D fluid mesh or fluid mesh entity for flow solution.
Does anyone see where this error message stems from, and what I could do to rectify it?
I'd be happy to add additional informations and/or screenshots. For now I've attached the files I used and the error message in a .rar file.
Thanks in advance, and best regards!
Lars.





RE: Error message in basic Flow Simulation [CFD analysis] NX7
Your mesh "3d_mesh(1)" is located in folder "Solid(2)", that is empty of properties, then the error. Simply "Drag & Drop" "3d_mesh(1)" in folder "Solid(1)" and you are done!.
Using the K-EPSILON turbulence model the CFD analysis solved in 18 iterations (less than 1 minute!!):
You can plot velocity results using posprocessing arrows:
Or animate results using streamlines:
Best regards,
Blas.
~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director
IBERISA
48011 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/
RE: Error message in basic Flow Simulation [CFD analysis] NX7
I was thinking it had to be something along these lines. I was working with a more complicated model, got the error. Tried to simplify it to just a pipe, and got the same thing!
Once again thank you very much. I look forward to playing around with this feature. :)
Regards, Lars.
RE: Error message in basic Flow Simulation [CFD analysis] NX7
I've played a bit with simulations of fluids in different geometries and conditions, but in a similar setup, is it possible to simulate the dynamic pressure? I can get the static pressure, is there another way around to just taking fluid velocity at different points and calculating it by hand?
Best regards,
Lars.