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Showing results 1 to 25 of 35 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX May 25, 2012, 07:27

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks I have never modelled solidifcation so cannot say... I have never modelled solidifcation so cannot say for sure. But my understanding of binary mixtures is that they are for gas/liquid pairs, not liquid/solid pairs. Additionally CFX has no model for...

Forum: CFX May 24, 2012, 18:37

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Of course, what you describe is the physics of... Of course, what you describe is the physics of solidification. But how are you going to implement it in CFX, given the tools it provides, and keep it accurate and numerically stable? It is the...

Forum: CFX May 24, 2012, 07:24

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks As I said in the other thread solidification... As I said in the other thread solidification modellign is not a supported model in CFX. I know people have done it but I suspect it is quite complex to set up. I would not worry about any of your...

Forum: CFX May 24, 2012, 07:20

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks I have never modelled solidifcation in CFX but I... I have never modelled solidifcation in CFX but I know people have done it. I suspect it is complex. You would have to ask CFX support for an example.

Forum: CFX May 23, 2012, 06:22

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Your post #67 is a question on accuracy - see the... Your post #67 is a question on accuracy - see the FAQ http://www.cfd-online.com/Wiki/Ansys_FAQ#Why_are_my_results_inaccurate.3F I do not understand your question in post #68.

Forum: CFX May 22, 2012, 19:27

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Once the simulation is done this is a basic post... Once the simulation is done this is a basic post processing operation. Have a look at the CFD-Post tutorials, and many of the CFX tutorials also include this sort of thing.

Forum: CFX May 21, 2012, 18:32

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks You have to write it as a CEL expression. They... You have to write it as a CEL expression. They can be tricky to write. I think the documentation has some information on this.

Forum: CFX May 21, 2012, 02:09

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks These functions simply define a region inside a... These functions simply define a region inside a sphere at an XYZ location. You would use this to define an initial condition of a spherical drop of stuff. And as you say, if you are using it as an...

Forum: CFX May 21, 2012, 00:41

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks The free surface is defined to be at volume... The free surface is defined to be at volume fraction = 0.5, so a isosurface at VF=0.5 lies on the modelled free surface.

Forum: CFX May 19, 2012, 07:23

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks The actual error is a few lines earlier: ... The actual error is a few lines earlier: Fatal bounds error detected --------------------------- Variable: liquid Ni.Dynamic Viscosity Locale : splat liquid Ni.Dynamic Viscosity...

Forum: CFX May 18, 2012, 07:51

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks I will let you work that one out. I will let you work that one out.

Forum: CFX May 18, 2012, 00:49

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks When a fluid domain has an interface with a solid... When a fluid domain has an interface with a solid domain the default connection simply couples them together, so the heat flux into one is matched by the heat flux out of the other. At the interface...

Forum: CFX May 17, 2012, 21:00

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks I do not understand your question, and I suspect... I do not understand your question, and I suspect you do not understand how CFX implements contact resistance, heat sources and interfaces. Of course thermal contact resistance transfers all the heat,...

Forum: CFX May 17, 2012, 20:34

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks There are many models to choose from. If you... There are many models to choose from. If you want no contact resistance just leave it at the defaults. If you want contact resistance use the contact resistance option. Alternately you can...

Forum: CFX May 17, 2012, 20:14

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks The interface automatically has the temperature... The interface automatically has the temperature coupled across the interface with zero contact resistance. You only need to change it if you want to add a heat source/sink, or a contact resistance.

Forum: CFX May 16, 2012, 23:07

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks The clipping warning says soem properties went... The clipping warning says soem properties went beyond the specified bounds. Either there is a region in your flow which exceeds your bounds, or the solution is not converged and weird material...

Forum: CFX May 16, 2012, 22:48

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Lots of options. You can: 1) Use a 1D... Lots of options. You can: 1) Use a 1D interpolation function 2) Curve fit a function and stick that in as a CEL expression 3) use nested if statements, if(T>2000[K],if(T<1000[K],7000[kg...

Forum: CFX May 16, 2012, 20:56

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Sorry, I do not understand your question. What do... Sorry, I do not understand your question. What do you mean by "if statement" worked to some extent? What do you mean by defining a range?

Forum: CFX May 13, 2012, 18:37

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Develop the model by yourself means applying... Develop the model by yourself means applying through the use of source and sink terms to create and destroy stuff, and do all the coupling to the energy equation yourself. How much of this is...

Forum: CFX May 13, 2012, 07:07

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Possible - yes, it is. Others have modelled it.... Possible - yes, it is. Others have modelled it. Is it easy - no. There is no built in model for it, so you are going to have to develop the model yourself. Can I recommend you do some study and...

Forum: CFX May 11, 2012, 07:11

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks While the spray dryer tutorial is a 3 phase... While the spray dryer tutorial is a 3 phase model, it is three very different phases to yours. Details make all the difference in multiphase models. In the spray dryer you have solids (modelled as...

Forum: CFX May 10, 2012, 23:49

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Sorry, I do not understand the question. Can you... Sorry, I do not understand the question. Can you phrase it more clearly?

Forum: CFX May 10, 2012, 06:42

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks Your question has now become "how do I do advance... Your question has now become "how do I do advance phase change modelling in CFX". I think this is too difficult a topic to discuss on the forum.

Forum: CFX May 9, 2012, 18:42

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks The whole idea of using just the material... The whole idea of using just the material properties to model phase change is an approximation. Things like latent heats, superheat/subcool, spinondal temperature/attainable limit of superheat etc...

Forum: CFX May 9, 2012, 07:26

Replies: 83 Conditional Expression in CFX Pre Views: 26,445 Posted By ghorrocks No, apply these functions as 1D interpolation... No, apply these functions as 1D interpolation functions. No need for fortran.

Showing results 1 to 25 of 35

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