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Showing results 1 to 9 of 9 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX February 12, 2014, 05:08

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks There are analytical solutions for capilliary... There are analytical solutions for capilliary flow in a tube so you should be able to estimate how much the surface will move in the time you have simulated. And yes, it is normal for timesteps to...

Forum: CFX February 11, 2014, 03:55

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks CFX (and just about allother CFD codes as well)... CFX (and just about allother CFD codes as well) need exceedingly small timesteps for surface tension driven flows. You need to lower your minimum time step size so it can go as small as it needs to....

Forum: CFX May 26, 2013, 07:20

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks I see. In that case you are going to have to... I see. In that case you are going to have to expect the simulation slows down as it hits this feature. When it hits there are all sorts of short time scale transients occurring as surface waves zip...

Forum: CFX May 25, 2013, 05:08

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks Does the free surface progress form the bottom to... Does the free surface progress form the bottom to the top, filling the tube and passing through the fine pores on the way?

Forum: CFX May 24, 2013, 19:19

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks Please post an image of the entire geometry so we... Please post an image of the entire geometry so we can see what this device actually is.

Forum: CFX May 24, 2013, 06:22

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks This means the simulation is grinding to a halt.... This means the simulation is grinding to a halt. Something has caused the convergence to be much harder in this region. Use the post processor to find what is causing the problem.

Forum: CFX May 19, 2013, 19:30

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks Usually the inlet at the bottom is at the level... Usually the inlet at the bottom is at the level of a free surface just next to it. That means the pressure at the inlet can be modelled with a total pressure inlet. Your initial time step is...

Forum: CFX May 19, 2013, 07:22

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks This is a multi phase flow, not a multi component... This is a multi phase flow, not a multi component flow. Multicomponent will not work here.

Forum: CFX May 18, 2013, 21:48

Replies: 17 Flow in a capillary tube CFX-Pre Views: 5,032 Posted By ghorrocks Before you model this flow with the default... Before you model this flow with the default options I recommed you try all the free surface options available in CFX. For this type of flow some work better than the defaults. Also, do not use...

Showing results 1 to 9 of 9

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