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Showing results 1 to 11 of 11 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX August 11, 2014, 18:51

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks inside() returns either 0 or 1. CFX is not quite... inside() returns either 0 or 1. CFX is not quite smart enough to map that to boolean true or false for the conditional statement. So you can either use if(inside()@somewhere=1,309[bar],0[bar]) or...

Forum: CFX August 11, 2014, 08:44

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks I seem to recall there is some new stuff which... I seem to recall there is some new stuff which allows this but I have never used it so am not sure. If I was doing this then I would define a mesh region and use that. But an important point:...

Forum: CFX August 8, 2014, 06:27

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks 1. Your expression returns a variable field of 0... 1. Your expression returns a variable field of 0 bar and 309 bar in all nodal points. 2. You can define many parameters this way, but there are some restrictions. Some material properties must be...

Forum: CFX July 30, 2014, 18:36

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks There are many ways of doing this and they are... There are many ways of doing this and they are all quite simple. Multiple domains works - but has disadvantages (reduced quality of partitioning of the domains for instance).

Forum: CFX July 29, 2014, 08:02

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks Try the reacting flow in a mixing tube tutorial. ... Try the reacting flow in a mixing tube tutorial. You can define initial conditions with CEL expressions, such as if(x>3[m],309[bar],0[bar]) or you could define a mesh region as a subdomain and use...

Forum: CFX July 29, 2014, 07:04

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks This simulation does not need two domains,... This simulation does not need two domains, regardless of what fluid model you use. It should be a single domain. But the penalty of running multiple domains is usually low, so hopefully you get away...

Forum: CFX July 27, 2014, 18:47

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks No, bad idea. I read from your initial post that... No, bad idea. I read from your initial post that it is high pressure helium escaping into low pressure air. In this case you should be using a single domain, multicomponent simulation. This will also...

Forum: CFX July 26, 2014, 06:18

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks CFX has models appropriate to go up to around... CFX has models appropriate to go up to around Mach 5. In other words CFX does not have hypersonics models (eg dissociation), but supersonic and transonic flow is modelled. Then you just initialise...

Forum: CFX July 22, 2014, 19:13

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks FAQ:... FAQ: http://www.cfd-online.com/Wiki/Ansys_FAQ#I_get_the_error_.22Floating_point_exception:_Overflow.22._What_does_this_mean_and_what_do_I_do_about_it.3F

Forum: CFX July 19, 2014, 06:18

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks No, what you are doing is essential. What it is... No, what you are doing is essential. What it is suggesting is that your flow is not 2D but is more likely 3D. I would recommend extruding a reasonable distance in the z direction and giving it plenty...

Forum: CFX July 17, 2014, 18:20

Replies: 24 CFX Simple valve model, inlet and outlet conditions Views: 6,208 Posted By ghorrocks This flow is going to be high Mach number so you... This flow is going to be high Mach number so you are going to need a better quality and resolution mesh that what you have. It is fine to use pressure inlets and outlets if that is the information...

Showing results 1 to 11 of 11

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