Research and Developments in Modularizing HVAC Elements for

CFD Software

Masashi IMANO

The University of Tokyo, Japan The Open CAE Society of Japan

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Outline

1. Introduction

2. What is “CFD parts”?

3. CFD analysis using “CFD parts”

4. The Open CAE society of Japan

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1. Introduction

2. What is “CFD parts”?

3. CFD analysis using “CFD parts”

4. The Open CAE society of Japan

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Introduction‣CFD in the design of HVAC (Heating, Ventilating, and Air Conditioning) system✓More and more important these days‣For most HVAC design engineers✓CFD is still difficult!✓Reproducing complex HVAC elements‣anemostat air diffuser‣four-way cassette type outlet, etc.

‣To use HVAC elements more easily in CFD ✓very important to be solved

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Introduction (contʼd)

‣Academic committee has been established in Japan ✓R&D in modularizing HVAC elements into “CFD parts”✓to make it more usable for HVAC design engineers‣“CFD parts” is a package✓information✓geometry data✓boundary data✓field data➡for reproducing HVAC elements in CFD

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CFD Parts

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<CAEData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../Schema/CAEdata.xsd" type="SimulationInput" version="0.1" byte_order="LittleEndian"> <Name lang="en">Anemostat type diffuser (Box method, heating)</Name>

‣The main file in CFD parts✓described in XML format

✓designed to share among various CFD software

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Academic committee‣Subcommittee of Integration of BIM and Modularization of HVAC Elements for CAE Software✓part of SHASE (the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan)✓now making out• draft of this CFD parts format• guideline for making and use of CFD Parts✓Commercial CFD software vendors in this committee

(2009 - 2010)

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1. Introduction

2. What is “CFD parts”?

3. CFD analysis using “CFD parts”

4. The Open CAE society of Japan

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What is “CFD Parts”?CFD parts is a package of information, geometry, boundary and field data file for reproducing HVAC element in CFD

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Structure of a CFD Parts

main.xmlthumbnail.pnggeometry.vtpmodelledGeometry.vtpmodelledBoundaryWall.vtpoutlet1.vtpoutlet2.vtpoutlet3.vtpoutlet4.vtpinlet.vtp

FourWayCassetteTypeOutletsVertical.cae (zipped file)

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Schema of XML file

e.g. velocity

e.g. “outlet no.1”

e.g. fixedValue,zeroGradient

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1. Introduction

2. What is “CFD parts”?

3. CFD analysis using “CFD parts”

4. The Open CAE society of Japan

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Anemostat air diffuser

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CFD parts of anemostat air diffuser

Locationof anemostat

Inlet

CFD partsAnemostat

Prof. Momoi and Prof. Kotani in Osaka University measured in detail and modelled with box method (2001)

Real shape

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Current status of CFD software

FlowDesigner(read natively)

STREAM(converter)

WindPerfectDX(converter)

OpenFOAM+xmlCFD(utility for mapping boundary conditions)

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Four-way cassette type outlet

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Measurement by PIV(Particle Image Velocimetry)

Laser HeadCamere

System Hub PCLaser Controller

Seeding Generator

Section 4 Section 3 Section 5(x=200mm)

Section 2 Section 1(central, x=0mm)

150mm

200mm

PIV measurement system

Measurement area

Measurement sections

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計測結果：水平吹き

○速度ベクトルを平均

○吹き出し角度：約３０度

断面３ 断面４ 断面５

断面１ 断面２

断面１（中央断面，x=0mm）

断面５（x=200mm）

PIV measurement results of velocity

Flow direction: Horizontal

U [m/s]Section 1 Section 2

Section 3 Section 4 Section 5

Section 5 (x=200mm)

Section 1 (x=0mm)

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Creating CFD parts

Modeled withbox method

Real shape &Measured results

Modeled shape &boundary conditions

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CFD analysis using CFD parts

1.5[m]

1.5[m]

1.5[m]

Symmetry boundary

Calculation domain:1/4 of full domain

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Correlation of wind velocity between measurement and CFD

-1

0

1

2

3

4

5

6

-1 0 1 2 3 4 5 6

Velo

city

(CFD

) [m

/s]

Velocity (Measurement) [m/s]

R2(w)=0.916R2(v)=0.852

-2

-1

0

1

2

3

4

5

6

-2 -1 0 1 2 3 4 5 6Ve

loci

ty (C

FD) [

m/s

]Velocity (Measurement) [m/s]

R2(w)=0.876R2(v)=0.744

Wind direction: Horizontal

Wind direction:Vertical

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OpenFOAM analysis using CFD partsCFD parts

xmlCFD(Utility for

mapping boundary conditions from

CFD parts)

!"#$"%&'(%"

)"*&+,"-.(#/0/'1

234

56!7

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Future works

‣Fix format of CFD parts‣Create more and more CFD parts under cooperation with several air-conditioning and air supply outlet manufacturers‣Create Web site for distributing CFD parts‣Publish OpenFOAM utility‣Other CFD software

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1. Introduction

2. What is “CFD parts”?

3. CFD analysis using “CFD parts”

4. The Open CAE society of Japan

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The Open CAE Society of Japan

‣Established: since Nov 2009‣Members: 107 (Including 6 supporting member and 12 student member)‣Workshop: Two times a year‣Japanese translation of user guide‣Hands on seminar: OpenFOAM, ParaView, Blender, etc.

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Open CAE Workshop@University of Tokyo

80-100 attendees

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Japanese translation

‣OpenFOAM User guide 1.7.1‣OpenFOAM Programmer’s guide ‣The ParaView Tutorials

(a.k.a. SC08-09 ParaView Tutorials)‣ESP-r (Building simulation)

Open FOAMオープンソース ツールボックス

ユーザガイド和訳

一般社団法人 オープン 学会

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‣Established: since June 2010‣OpenFOAM Study Meetings: in Tokyo and Osaka‣Open Source CAE Study Meeting: in Gifu✓OpenFOAM, Paraview, Salome-Meca, Blender, etc.‣Ustream broadcasting and recording: in Tokyo

Monthly Open Source CAE Study Meetings in Japan

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See you at OpenFOAM workshopin Japan someday!

Thank you!

Any questions?

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