[zacko]

Hello there,

I just started learning CFX and for that I'm trying to made a small simulation with an axial turbine model.
I read the WiKi about what I should look at and I used a YouTube Video of an Centrifugal Pump to set up my simulation.

When I run the simulation a Failure was mentioned, which was already in a forum but there was no solution I could deal with.

+--------------------------------------------------------------------+
|
| FATAL ERROR :
|
| Initial values are required for all variables in TRANSIENT runs.
| In this simulation, no initial value was set for
|
| Variable : Velocity
| Domain : Turbine
|
| The value can be set using the Initialisation Branch in CFX Pre.
|
| To bypass this message and use default solver initial values,
| set the expert parameter "transient initialisation override = t"
|
+--------------------------------------------------------------------+I don't know what it actually means. There is a problem with the velocity, but I made all boundaries I know. Static pressure at the inlet and a normal speed at the outlet.

If you need more Information from the output-file say it.
And sorry If there are any big language mistakes, I'm from germany

Maybe someone can help me

Thank you !

[underrelaxed]

What were the initialization options used in the video tutorial? They appear to be missing. Check your domain setup under the Initialization tab.

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[-Maxim-]

you should use a converged steady-state result to start your transient simulation.
Are you sure you need a transient simulation in the first place? Maybe we start with you describing in detail what you would like to simulate and some screenshots of your setup.

[zacko]

Yes the Initialization options were not showed in the Video, so I added them like i thought.

Read again the WiKi again and i should definetly use a steady state simulation. In Autodesk CFD, what I used before, the Transient option was always used.

So what I want to simulate is a axial turbine model, based on a "Hubless Rim Thruster" Design. It is a hubless turbine.
At the Inlet should be a pressure of 5bar and the velocity should be near to 3m/s.

I defined a Rotation and a stationary Area. The Rotation Area are the blades and the hub. The stationary Area is like the casing.

Added two pictures of CFX Setup.

[-Maxim-]

I would suggest you go through some of the tutorials in CFX. There it is explained how you setup a case with rotating parts and interfaces between rotating and stationary parts

[zacko]

Okay maybe a good idea - any hint which tutorial I should use ?