CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums

Search Results

Register Blogs Community New Posts Updated Threads Search

Showing results 1 to 9 of 9
Search took 0.00 seconds. Search: Posts Made By: ghorrocks
Forum: CFX January 12, 2014, 06:18
Replies: 25
Views: 5,939
Posted By ghorrocks
If your flow is near turbulence transition it is...

If your flow is near turbulence transition it is going to be very tricky. Normal turbulence models do not work well in this region (but some work better than others - SST is far better than normal...
Forum: CFX December 12, 2013, 05:55
Replies: 25
Views: 5,939
Posted By ghorrocks
In that case I would not put a pressure boundary...

In that case I would not put a pressure boundary on the bottom surface. I would just model the entire tank with its external wall, that is include the botttom half of the tank as well. Then there is...
Forum: CFX December 12, 2013, 05:36
Replies: 25
Views: 5,939
Posted By ghorrocks
To answer whether you need the pressure on the...

To answer whether you need the pressure on the bottom I need to know a little more about what you are doing:

Is the image on post #7 the full simulation domain? Is there anything else you are...
Forum: CFX December 12, 2013, 05:24
Replies: 25
Views: 5,939
Posted By ghorrocks
So the pressure ramp up can be modelled with the...

So the pressure ramp up can be modelled with the safety valve closed (ie a wall) and the open period as a pressure outlet.

But linear buoyancy models do not care about the absolute pressure, the...
Forum: CFX December 11, 2013, 05:23
Replies: 25
Views: 5,939
Posted By ghorrocks
If the tank is closed then you do not know the...

If the tank is closed then you do not know the pressure at the top. Assigning that point the reference point does not fix the pressure to zero relative pressure.

The pressure will be regulated by...
Forum: CFX December 10, 2013, 16:52
Replies: 25
Views: 5,939
Posted By ghorrocks
Your domain is closed so you don't know what the...

Your domain is closed so you don't know what the pressure is at the top of the tank. So the pressure at the bottom of the tank is 100mbar above an unknown number - so that is unknown.

Can you...
Forum: CFX December 10, 2013, 04:58
Replies: 25
Views: 5,939
Posted By ghorrocks
Yes, that explains what you are doing a lot...

Yes, that explains what you are doing a lot better.

Some comments:
1) Is the level of the fluid free surface constant? If so can the free surface be replaced with a wall or a pressure boundary?...
Forum: CFX December 9, 2013, 16:27
Replies: 25
Views: 5,939
Posted By ghorrocks
The image helps but I have no idea what it means....

The image helps but I have no idea what it means. You are going to have to label what the important components are, and what the fluid is expected to do in it.
Forum: CFX December 7, 2013, 04:12
Replies: 25
Views: 5,939
Posted By ghorrocks
An image of what you are talking about would help.

An image of what you are talking about would help.
Showing results 1 to 9 of 9

 
Forum Jump

All times are GMT -4. The time now is 12:48.

Contact Us - CFD Online - Privacy Statement - Top