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Showing results 1 to 19 of 19 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX February 22, 2018, 21:41

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks Have you read the best practices guide for... Have you read the best practices guide for cavitation modelling in the CFX documentation? That gives a lot of background in how to make cavitation models work properly.

Forum: CFX February 22, 2018, 21:21

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks What does the convergence looks like? Is it still... What does the convergence looks like? Is it still converged? What does the flow field look like? Have a look in CFD-Post.

Forum: CFX February 22, 2018, 20:00

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks That is sounding more realistic. That is sounding more realistic.

Forum: CFX February 22, 2018, 19:45

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks kg/m3 is the units for density. Please check your... kg/m3 is the units for density. Please check your units. And if you meant 1602 Pa then your pressure is less than the vapour pressure of your liquid. Is this what you intended? Does the fluid...

Forum: CFX February 22, 2018, 18:47

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks For your model where the pressure is very close... For your model where the pressure is very close to absolute zero anyway then using a zero reference pressure is OK.

Forum: CFX February 22, 2018, 18:26

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks The inlet at 1.63Pa with a reference pressure of... The inlet at 1.63Pa with a reference pressure of 0 atm does like an extreme vacuum to me. Does this pump operate in a vacuum environment? Most of the time you want to set the inlet pressure to 0...

Forum: CFX February 22, 2018, 18:08

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks I would recommend: areaAve(p)@ R1... I would recommend: areaAve(p)@ R1 Inlet-(3170[Pa]/(areaAve(Density)@ R1 Inlet*g)) You should use static pressure, not total pressure; you should get density from the simulation rather than hard...

Forum: CFX February 4, 2018, 16:42

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks I have no idea what you are looking for so cannot... I have no idea what you are looking for so cannot say if those results are OK. The main thing you do to check a simulation is OK is: * validate against a benchmark result or experiment results. *...

Forum: CFX January 31, 2018, 04:39

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks Before you do any simulation you need to do some... Before you do any simulation you need to do some basic validation and verification first. The most important bit of this is to determine what mesh, time step and convergence criteria is required for...

Forum: CFX January 30, 2018, 16:53

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks Please do not PM me with duplicates of posts you... Please do not PM me with duplicates of posts you have made on the forum. If it is on the forum I will see it. Is this a steady state or transient simulation? This does not look converged...

Forum: CFX December 6, 2017, 19:12

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks In that case do some transient simulation... In that case do some transient simulation tutorials so you see the additional options for transient simulations. But when you set up your case I strongly recommend you use adaptive time stepping,...

Forum: CFX December 4, 2017, 15:52

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks This is very basic CFX stuff - have you done the... This is very basic CFX stuff - have you done the CFX tutorials? They are available on the ANSYS Customer webpage. The error is simply saying you need to define an initial condition, and that you...

Forum: CFX December 3, 2017, 16:35

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks I am not familiar with the features of Fluent.... I am not familiar with the features of Fluent. CFX does have some Fourier methods for doing rotating machinery, but I don't think they are appropriate for what you are looking at. So I do not think...

Forum: CFX December 2, 2017, 18:29

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks That sounds very good, that sounds like the sort... That sounds very good, that sounds like the sort of data you need. Have you successfully reproduced the cavitation spectrums, either for the journal article or the company's impeller?

Forum: CFX December 1, 2017, 18:55

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks OK, good. This is definitely a post-graduate... OK, good. This is definitely a post-graduate level project, so I am glad to hear you are a post-graduate. My recommendation would be to use CFX (of course, I am biased there), but to then do a...

Forum: CFX November 30, 2017, 19:36

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks Do you mean using FlowWorks or whatever the CFD... Do you mean using FlowWorks or whatever the CFD solver in Solidworks is? The difficulty is in understanding the physics and developing appropriate models for it. You will have this issue regardless...

Forum: CFX November 30, 2017, 16:49

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks Transient cavitation model means a cavitation... Transient cavitation model means a cavitation model in a transient simulation. So you can get the time history of the pressure, which you obviously need for a vibration spectrum. You need to do...

Forum: CFX November 30, 2017, 16:18

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks You could theoretically do it in any CFD code... You could theoretically do it in any CFD code with a cavitation model. Then you can do any post processing on it you like. But my point is to get this accurate, regardless of the solver, will be very...

Forum: CFX November 29, 2017, 16:46

Replies: 40 Centrifugal Pump Cavitation Views: 4,141 Posted By ghorrocks This sounds very challenging. I am not sure the... This sounds very challenging. I am not sure the built in cavitation model in CFX will be suitable for this. I would recommend you try a transient cavitation model and compare the spectrum against...

Showing results 1 to 19 of 19

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