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Search took 0.00 seconds. Search: Posts Made By: SeVV
Forum: CFX July 28, 2018, 04:21
Replies: 92
Views: 7,212
Posted By SeVV
Thank You Glen. I was checking the differences...

Thank You Glen.
I was checking the differences between results of 1e-4 and 1e-5 RMS and it was not significant difference for results I am interested in.

I understand that for getting the...
Forum: CFX July 27, 2018, 10:50
Replies: 92
Views: 7,212
Posted By SeVV
Thank You for reply. Here I am attaching my last...

Thank You for reply. Here I am attaching my last output file, mayby it would be helpful to judge what`s wrong.
So what is the best way to add the heat source for cylindrical surface? I am adding the...
Forum: CFX July 23, 2018, 08:33
Replies: 92
Views: 7,212
Posted By SeVV
Unfortunately Something is still wrong with my...

Unfortunately Something is still wrong with my solid-fluid interface. There is no heat transfer between the hot inner surface of funnel and the adjacent fluid wall. It looks like it is insulated and...
Forum: CFX July 17, 2018, 13:40
Replies: 92
Views: 7,212
Posted By SeVV
Excuse me but I was in big mistake. I need to...

Excuse me but I was in big mistake. I need to treat my case as a forced convection heat transfer. In my simulation I`ve assumed that I have two heat sources: the inner surface of workpiece (c.a. 150...
Forum: CFX July 9, 2018, 16:32
Replies: 92
Views: 7,212
Posted By SeVV
Can I somehow calculate the "heat transfer...

Can I somehow calculate the "heat transfer coefficent" for the (AIR|OIL) Fluid Pair model? Is there any equation or tables with approximated values?
Or maybe in case when I do not know the heat...
Forum: CFX June 18, 2018, 17:13
Replies: 92
Views: 7,212
Posted By SeVV
Excuse me, ofcourse I’m not. There is air with...

Excuse me, ofcourse I’m not. There is air with free convection on the outside. But I’m not sure what I should start with.
Forum: CFX June 18, 2018, 11:29
Replies: 92
Views: 7,212
Posted By SeVV
Thank You very much. I was confused about the...

Thank You very much.
I was confused about the interpretation of strn frame and the interface Type because after changing the interface to translation periodicity both the ‚velocity’ and ‚velocity in...
Forum: CFX June 18, 2018, 08:58
Replies: 92
Views: 7,212
Posted By SeVV
Welcome again after break. I`ve included the...

Welcome again after break.

I`ve included the following suggestions:
-there is no buoyancy now;
-I`ve switched the turbulence model do SST again.

Moreover:
-I was dealing with the "Air at 25...
Forum: CFX May 5, 2018, 16:58
Replies: 92
Views: 7,212
Posted By SeVV
I've set the maximum coefficient loops of 20 and...

I've set the maximum coefficient loops of 20 and even more. Initial time step and minimum time step values were reduced as You`ve adviced too (few different options including the 1e-10). I've tried...
Forum: CFX April 12, 2018, 05:30
Replies: 92
Views: 7,212
Posted By SeVV
I`ve abandoned the steady state simulation...

I`ve abandoned the steady state simulation because proceeding it with physical time step was not possible. Now I`m still trying to perform the transient simulation. I`m trying to set the proper time...
Forum: CFX March 28, 2018, 07:19
Replies: 92
Views: 7,212
Posted By SeVV
I`ve abandoned the steady state simulation for...

I`ve abandoned the steady state simulation for now and I`m trying to perform the transient one as You`ve adviced me.
I`ve read about the adaptive time step in the FAQ and it seems to be the safiest...
Forum: CFX March 26, 2018, 16:08
Replies: 92
Views: 7,212
Posted By SeVV
I was afraid that the transient simulation will...

I was afraid that the transient simulation will be inevitable but I am still givin it a little chance in steady state due to the graphs which I`ve obtained after changing the local time scale factor...
Forum: CFX March 26, 2018, 06:12
Replies: 92
Views: 7,212
Posted By SeVV
Ok, I`ve changed it from the CFX-pre to avoid...

Ok, I`ve changed it from the CFX-pre to avoid solver crash.
Glen, I`ve read the information about when to use the local time step in FAQ but I`m not sure do I need to keep trying with local time...
Forum: CFX March 26, 2018, 03:58
Replies: 92
Views: 7,212
Posted By SeVV
Ok, I`ll try it. Should I have to keep the local...

Ok, I`ll try it. Should I have to keep the local time scale or change the type to physical? And should I stop the solver, change the time step and continue or run it again from the beginning? And can...
Forum: CFX March 26, 2018, 03:12
Replies: 92
Views: 7,212
Posted By SeVV
Thank You for information. I will try to enable...

Thank You for information. I will try to enable total energy equation and proceed the simulation. Now I am attaching the graphs of simulation which is running for over 2 days. I`m afraid it wouldn`t...
Forum: CFX March 24, 2018, 05:23
Replies: 92
Views: 7,212
Posted By SeVV
But how can I achieve the speed greater than 50...

But how can I achieve the speed greater than 50 m/s? This is the maximum velocity of rotating grinding wheel in this process. And why we need to monitor the sound speed? Is it connected with the CFX...
Forum: CFX March 23, 2018, 17:12
Replies: 92
Views: 7,212
Posted By SeVV
I`m affraid that You`re so right with the first...

I`m affraid that You`re so right with the first sentence. I am dealing with this since July and feel that it is so tough to do it well without a supervisor who would show how it works live..
I`ve...
Forum: CFX March 23, 2018, 16:32
Replies: 92
Views: 7,212
Posted By SeVV
I was setting the iterations number up to 150,...

I was setting the iterations number up to 150, maybe to 200 once. What is the upper limit worth to try? 300, 500? What can I do to improve imbalance of values described by those two lines? The steady...
Forum: CFX March 23, 2018, 15:05
Replies: 92
Views: 7,212
Posted By SeVV
Thank You for quick instruction, that is very...

Thank You for quick instruction, that is very useful. I am attaching the imbalance plot. Am I right that it looks bad..? So the biggest problem is imbalance of volume momentum of "OIL" in "CHANNELS"...
Forum: CFX March 23, 2018, 09:04
Replies: 92
Views: 7,212
Posted By SeVV
And do I need to create this graph in the CFX-PRE...

And do I need to create this graph in the CFX-PRE or CFX-Solver?
Forum: CFX March 23, 2018, 08:42
Replies: 92
Views: 7,212
Posted By SeVV
Glen, could You explain please what do You mean...

Glen, could You explain please what do You mean 'grinding wheel and oil mist ports'? Do You mean 'portions'? Here I am attaching the volume fractions history plot and the velocities in st frame....
Forum: CFX March 23, 2018, 05:52
Replies: 92
Views: 7,212
Posted By SeVV
I`ve spent 2 whole days on this simulation and I...

I`ve spent 2 whole days on this simulation and I think that I`m closer to the finish line. I think that it should looks like on attached images (im1, im2, im3, im4). It`s not perfect but I think it...
Forum: CFX March 19, 2018, 08:26
Replies: 92
Views: 7,212
Posted By SeVV
I am simulating as a steady state simulation. I...

I am simulating as a steady state simulation. I am using the frozen rotor interfaces (is it good approach?). I don`t know what am I doing wrong but when I set the single phase flow simulation (with...
Forum: CFX March 13, 2018, 06:48
Replies: 92
Views: 7,212
Posted By SeVV
Glen, in my case the solution was to change the...

Glen, in my case the solution was to change the time scale from automatic to physical (what I`ve overlooked) and to increase the time step as You`ve said. I`ve checked the fluid residence time (as...
Forum: CFX March 8, 2018, 05:20
Replies: 92
Views: 7,212
Posted By SeVV
Excuse me for so long delay in posting. I was...

Excuse me for so long delay in posting. I was studying the documentation and trying to understand it. Now I know that I want to use a dispersed fluid flow for Oil domain and if it is possible I want...
Showing results 1 to 25 of 45
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