questions about chtMultiRegion tutorial

boffin5 · August 5, 2021, 17:22

As a step in my goal to learn how to simulate car radiators, I ran the v2012 tutorial, 'heat exchanger' under the chtMultiRegionSimpleFoam folder. Attached is a paraview image of the result, which shows some things I don't understand.
The left and right faces of the porous media are specified as inlet and outlet. Why are the upper and lower faces not named in this way? Maybe it's related to the porous media axes system?
Although difficult to see in the image, under the porous media are four blades. As the streamlines show, they don't rotate, and I'm wondering why they were included in the tutorial; they don't seem to add anything.
I hope to hear comments from anyone familiar with this tutorial.

snak · August 7, 2021, 08:14

Hi,

You are using SimpleFoam. Only the steady field is simulated. So, the blades do not rotate.

However, a MRF zone (named MRF1, created from rotor cellZone) exists. MRF1 is adding rotational effects. If you look closely, streamlines and velocity fields shows those effects.

boffin5 · August 7, 2021, 11:22

Thank You Nakagawa-san. Your comments will help me to understand this tutorial much better.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Map of the OpenFOAM Forum - Understanding where to post your questions!	wyldckat	OpenFOAM	10	September 2, 2021 05:29
CFD Fluent tutorial - Shell and tube heat exchanger - PROBLEM	tom96	FLUENT	1	May 21, 2018 00:24
A few questions about Gmsh: Background Mesh and Tutorial 7	SeanQuallen	Main CFD Forum	2	November 27, 2017 03:28
Simple questions regarding CCM+ tutorials	daniel1030	STAR-CCM+	2	December 28, 2014 00:03
[Gmsh] 2D Mesh Generation Tutorial for GMSH	aeroslacker	OpenFOAM Meshing & Mesh Conversion	12	January 19, 2012 03:52

August 7, 2021, 08:14		#2
snak Senior Member shinji nakagawa Join Date: Mar 2009 Location: Japan Posts: 113 Blog Entries: 1 Rep Power: 18	Hi, You are using SimpleFoam. Only the steady field is simulated. So, the blades do not rotate. However, a MRF zone (named MRF1, created from rotor cellZone) exists. MRF1 is adding rotational effects. If you look closely, streamlines and velocity fields shows those effects.

August 7, 2021, 11:22		#3
boffin5 Senior Member Alan w Join Date: Feb 2021 Posts: 260 Rep Power: 6	Thank You Nakagawa-san. Your comments will help me to understand this tutorial much better.