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Search took 0.00 seconds. Search: Posts Made By: ghorrocks
Forum: CFX February 6, 2018, 00:12
Replies: 58
Views: 31,804
Posted By ghorrocks
To calculate torque the results needs pressure,...

To calculate torque the results needs pressure, wall shear stress and the mesh. If any of these are missing from your results file you will not be able to calculate the force (or torque). They are in...
Forum: CFX January 23, 2018, 16:47
Replies: 58
Views: 31,804
Posted By ghorrocks
Quoting the FAQ...

Quoting the FAQ (https://www.cfd-online.com/Wiki/Ansys_FAQ#How_should_I_ask_my_question_on_the_CFX_forum_to_get_the_best_possible_answer.3F) - "Dont ask over broad questions e.g. "How do I simulate a...
Forum: CFX October 25, 2017, 06:07
Replies: 58
Views: 31,804
Posted By ghorrocks
The torque increasing with speed could be real or...

The torque increasing with speed could be real or it could be numerical error.

If it is real it is saying the maximum torque point is at a faster speed than you are currently modelling. This is...
Forum: CFX February 8, 2016, 04:42
Replies: 58
Views: 31,804
Posted By ghorrocks
Twist angle and chord length are blade design...

Twist angle and chord length are blade design parameters - so please refer to post #44.

If I have misunderstood your question then please explain it more.
Forum: CFX February 7, 2016, 16:49
Replies: 58
Views: 31,804
Posted By ghorrocks
That sounds like basic turbomachinery design...

That sounds like basic turbomachinery design question, not a CFX question. Try a turbomachinery textbook or training course, or turbomachinery design software (like turbogrid).
Forum: CFX February 1, 2016, 15:54
Replies: 58
Views: 31,804
Posted By ghorrocks
The power at the rotor shaft (torque x omega)...

The power at the rotor shaft (torque x omega) should match the torque at the rotor shaft of the turbine.
Forum: CFX October 16, 2014, 05:27
Replies: 58
Views: 31,804
Posted By ghorrocks
You will need to know a pressure somewhere to set...

You will need to know a pressure somewhere to set the pressure level.

Look at the CFX tutorials for how to run simulations.

And in future, if you have a new question start a new thread rather...
Forum: CFX October 8, 2013, 05:48
Replies: 58
Views: 31,804
Posted By ghorrocks
To get the correct result in a rotating machine...

To get the correct result in a rotating machine simulation, you need to not only get the numerics correct, but you also need to get the operating point correct. This means that the rotation speed...
Forum: CFX October 7, 2013, 18:08
Replies: 58
Views: 31,804
Posted By ghorrocks
Just had a look at the torque function in the CFX...

Just had a look at the torque function in the CFX reference manual. If you use the torque_x, torque_y, torque_z functions it returns the torque about the X, Y and Z coordinate axis respectively (and...
Forum: CFX October 7, 2013, 17:42
Replies: 58
Views: 31,804
Posted By ghorrocks
It looks like you are modelling the whole thing...

It looks like you are modelling the whole thing so you are correct to use pitch change=none. As for the negative torque, have you checked the vector direction of the torque?
Forum: CFX April 16, 2011, 07:34
Replies: 58
Views: 31,804
Posted By ghorrocks
My point was simply that for even blade loading,...

My point was simply that for even blade loading, each blade supplies 1/n of the torque. I said nothing about how much extra torque you get by adding more blades. That is a different question so don't...
Forum: CFX August 30, 2009, 07:23
Replies: 58
Views: 31,804
Posted By ghorrocks
Have you read through this? ...

Have you read through this?

http://www.cfd-online.com/Wiki/Ansys_FAQ#My_steady_state_solution_converges_for_a_while_but_stops_converging_before_reaching_my_convergence_criteria
Forum: CFX July 18, 2009, 20:22
Replies: 58
Views: 31,804
Posted By ghorrocks
Hi, You can import the IGES into...

Hi,

You can import the IGES into Designmodeller (or solidworks) and make a solid region. Then take the solid region into Workbench and mesh it in Simulation.

Glenn Horrocks
Forum: CFX July 5, 2009, 19:18
Replies: 58
Views: 31,804
Posted By ghorrocks
No, that is not what I am saying at all. Please...

No, that is not what I am saying at all. Please read my original post again carefully.

Glenn Horrocks
Forum: CFX July 5, 2009, 06:31
Replies: 58
Views: 31,804
Posted By ghorrocks
Hi, But assuming each blade is equally...

Hi,

But assuming each blade is equally loaded then the total power is simply n times the power of one blade, regardless of how much power additional blades actually add.

Also you may find the...
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