CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Static heat spot on rotating drum

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   April 13, 2020, 18:44
Default Static heat spot on rotating drum
New Member
Join Date: Oct 2019
Posts: 3
Rep Power: 5
coms0 is on a distinguished road
Hi everybody,

I am using ANSYS Fluent to simulate the rotation of a drum (made of titanium as external walls) and filled with water (so basically a rotating cilynder with a water volume inside and a titanium volume outside).

In order to make everything rotate, I set the frame motion in rotation (alwasy at 63 rad/s) in absolute reference, both for the solid and the water body settings. Then I also set the wall boundary condition of the fluid body with a rotational velocity of 63 rad/s on absolute reference.

I am now applying a heat spot both in solid and water volumes (it is a penetrating heat beam laser that pass through the solid walls and goes 3mm deep in the water). To simulate this I use 2 UDF define_source functions (one in solid volume and the other in water volume).

Velocity and pressure profiles seem correct from the result (so the drum is rotating). The beam spot on the solid wall seem to be indeed static while the wall rotates, creating then a heat wake, as seen in photo below.

But instead in the water volume, it seems that the heat spot and the water wall boundary are both static (so that the wall boundary is not rotating). But the velocity plot clearly show the correct rotational velocity gradient (max at the wall and decreasing towards the center).

I thought the problem could have been in the frame motion settings, but even changing them the result didn't change. Could be an interface problem (which I set as coupled)? I don't know.

Can someone please help me?

Thank you,

Attached Images
File Type: jpg water heat temp.jpg (26.1 KB, 5 views)
File Type: jpg shell spot temperature.jpg (43.0 KB, 5 views)
coms0 is offline   Reply With Quote

Old   April 14, 2020, 03:44
Default Rotation Setup
Senior Member
vinerm's Avatar
Join Date: Jun 2009
Location: Nederland
Posts: 2,946
Blog Entries: 1
Rep Power: 34
vinerm will become famous soon enough
If both, the drum and the water inside, are supposed to be rotating, what is the objective behind applying a wall velocity. That is required only when the solid is not included in the simulation and the solid is supposedly stationary and not moving. You have solid included and it is in motion. So, you should not apply any rotation to the wall.

PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.
vinerm is offline   Reply With Quote


define_source, frame motion, heat

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Interface between static and rotating cell zone bobdorm14 FLUENT 3 November 2, 2016 05:36
Car external aerodynamic with wheel spinning issue hokhay FloEFD, FloWorks & FloTHERM 2 August 18, 2016 04:23
Rotating immersed solid (part remains static) stuw CFX 4 February 11, 2015 03:29
GGI: rotating object completely within a static object Tobb OpenFOAM 2 October 15, 2010 06:29
rotating solid zone with heat transfer Sasha FLUENT 1 March 24, 2009 16:55

All times are GMT -4. The time now is 13:54.