phoenics user meeting 2006 phoenics today phoenics 2006 december computer simulation of fluid flow,...

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

PHOENICS

2006 December

Computer Simulation of Fluid Flow, Heat Flow, Chemical Reactions and Stress in Solids.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Contents

• This presentation shows some of the new features in PHOENICS 2006

• The talk is in four parts:– Pre-processor (VR-Editor)– Post-processor (VR-Viewer)– Solver (Earth)– General improvements (common to all

modules)– Special Purpose versions

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • An auto meshing feature has

been added. For most cases the Editor will generate a reasonable grid with little or no user input.

• The grid distribution is based on a maximum cell size (as a fraction of the domain size), and a maximum change in cell size across region boundaries.

VR Editor Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The default grid can then be

easily refined


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The treatment of Polar geometries

has been significantly updated.

• As a reminder, in polar co-ordinates– X is θ, the angle (in radians!)

– Y is r, the radius

– Z is z, the axial distance.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • For objects using the default

'polcu' geometries, the size is set in (dθ,dr,dz) and position in (θ,r,z) as before.

• For non-'polcu' geometries, including STL imports, the size is in Cartesian (dx,dy,dz), but position is still in (θ,r,z).


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • As the Cartesian size is used, the

shape and size of the object are preserved with no distortion.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • This allows us to use more

suitable grids…


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The treatment of INLET objects in

Polar co-ordinates has been improved. The inflow can now be specified as:– Cartesian velocity components

– Polar (grid-directed) velocity components

– Volumetric flow rate

– Mass flow rate


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


• The 'Slide velocity' can be set for blockages as well as for plates.

• By setting the surface velocity, a range of cases involving steady movement can be treated as steady-state.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


• In Cartesian co-ordinates, the 'Spin' option sets the surface velocity as if the object were rotating about its axis.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


• In Polar co-ordinates , the slide velocity can be in m/s or radians/s.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• Heat-transfer between the blockage and the surrounding fluid is controlled by the blockage external heat-transfer coefficient.


• By default, this is obtained from the wall-functions.

• Alternatively, a user-set constant value can be supplied.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • A new object type TRANSFER has

been introduced.

• It allows the outflow from one solution to be used as the inflow to another.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• INLET and OUTLET objects can also be ‘tagged’ to act as Import or Export TRANSFER objects

• Only the shape of the Import/Export object needs to be the same between runs – the grid does not need to be identical

• The data to be transferred is held in an ASCII text file


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The new object types ANGLED-IN and

ANGLED-OUT have been introduced.

• These allow inlets and outlets of any arbitrary shape to be placed on the outer surface of any arbitrarily-shaped blockage.

• The area of action is the area of intersection between the object and any blockage.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • A new object type ASSEMBLY

has been introduced.• The assembly object

acts as a ‘container’ for any number of other objects, which go together to make a component.

• Objects are added to an assembly object through the Hierarchy dialog.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Components can be

added or removed from an assembly


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • All size and position changes

made to the assembly object are also applied to all the components.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • All the objects in

the assembly can then be exported to a single file.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The saved assembly objects can then

be imported into another model.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Objects can be partially pushed out

of the domain, to allow:

– Solution over one half of a body, or

– Solution over any part of a large STL


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The Editor can output the entire

geometry in TECPLOT format.


• Each object is shown in TECPLOT as a 'zone'.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The Editor can also output the

entire geometry as a FieldView unstructured file.


• Each object is shown in FieldView as a Boundary.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • This is what the Editor makes of it.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• When PARSOL is active in Polar co-ordinates, the contours and vectors in the cut cells are displayed correctly.

VR ViewerImprovements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


Valve simulation

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • When cyclic boundary conditions

are active, an extra tab appears on the Viewer Options dialog.


• From here it is possible to repeat the image in the X direction as many times as wanted .

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The original geometry


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Repeated 9 times


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The contours repeated


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The colour palette can be reversed


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Streamlines can also be repeated


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• The sources and sinks for an object can be displayed:


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • For selected objects, the surface

contour values can be output to a file which can be read into Excel or Autoplot.


3D Nav.Sto.Flow Around A Moving Van Pressure surface values for object BODY2 ----------------------------------------- X Y Z Pressure 1.0000E+00 3.0000E+00 6.0000E+00 -1.1501E+01 8.7500E-01 3.0000E+00 6.0000E+00 -8.1237E+00 8.7500E-01 3.0000E+00 6.5000E+00 -2.0226E+01 1.0000E+00 3.0000E+00 6.5000E+00 -2.1001E+01 1.0000E+00 3.0000E+00 6.5000E+00 -2.1001E+01 8.7500E-01 3.0000E+00 6.5000E+00 -2.0226E+01 8.7500E-01 3.0000E+00 7.0000E+00 -3.2328E+01 1.0000E+00 3.0000E+00 7.0000E+00 -3.0502E+01

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • For selected objects, a surface profile on

the current plotting plane can be output to a file which can be read into Excel or Autoplot.


X Y Z Pressure 1.000000E+00 1.583333E+00 8.250000E+00 -1.893729E+01 1.000000E+00 1.750000E+00 8.250000E+00 -1.884477E+01 1.000000E+00 1.916667E+00 8.250000E+00 -1.866686E+01 1.000000E+00 2.083333E+00 8.250000E+00 -1.838086E+01 1.000000E+00 2.250000E+00 8.250000E+00 -1.799543E+01 1.000000E+00 2.416667E+00 8.250000E+00 -1.749649E+01 1.000000E+00 2.583333E+00 8.250000E+00 -1.690780E+01 1.000000E+00 2.750000E+00 8.250000E+00 -1.624763E+01 1.000000E+00 2.916667E+00 8.250000E+00 -1.554297E+01

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Pressure profile on an aerofoil


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • For buoyancy-driven flows, the effect of

buoyancy on turbulence can be significant.

• In stably-stratified flows, such as smoke layers, turbulence can be damped. Conversely, in the vicinity of plumes, the turbulence can be enhanced.

• These effects are implemented in the K-ε models via an additional source term.

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The choice between stable or

unstable stratification was previously made by setting a constant to 0.0 or 1.0, and so could never be universally correct.

• An 'auto' function has been introduced which switches between the stable and unstable forms depending on the local flow direction.

• This should produce better results for cases with zones of both stable and unstable stratification.

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Geometry of standard room fire

test– 62.9MW steady fire

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Buoyancy constant = 0 -> layered

flow

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Buoyancy constant = 1 -> Plume

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Calculated buoyancy constant

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • Auto solution is somewhere

between plume and layer!

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• The solution can be output in TECPLOT format.

• An output file, TECDATA.DAT, containing two TECPLOT zones for each PHOENICS domain is written.

• The first zone contains data at the cell centres (adjusted for PARSOL cut cells), and the second contains data at the cell corners.

• The first is better for plotting vectors, the second for plotting contours and iso-surfaces.

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Earth Improvements

• The geometry and solution from Library case V146 displayed in TECPLOT 10.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• The solution can be output to FieldView in PLOT3D format.

• Two output files, FVDATA.G and FVDATA.F, containing two grids for each PHOENICS domain are written.

• The first zone contains data at the cell centres (adjusted for PARSOL cut cells), and the second contains data at the cell corners.

• The first is better for plotting vectors, the second for plotting contours and iso-surfaces.

Earth Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Earth Improvements

• The geometry and solution from Library case V146 displayed in FieldView 11.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • In addition to the normal multi-

coloured vectors, we can have


• Vectors all in one colour• Or any thickness

• Or with the size of long vectors limited

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • A ‘quick-zoom’ function has been

added

• Press the control key then move the mouse sideways to drag a zoom-box.

General Improvements

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 The axes can be ‘unlocked’ from

the domain origin, and placed anywhere


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 The hand-set icons appear on the

tool bar, so the hand-sets can be turned off


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 The image can be annotated with

text strings


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 We are now testing a 64-bit

Windows version of PHOENICS It does not suffer from the

memory limitations of the 32-bit versions

Preliminary tests seem to show that performance is very similar, however many bits there are!


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

The location of the PHOENICS installation is now held in an environment variable.

This makes it possible to install PHOENICS into any convenient location, not just the root of a drive.

It also makes network installations neater, as only the environment variable and a working directory need be present on client machines.


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

SPP Improvements

• The following Special-purpose versions have been brought into the VR environment:−CVD, for Chemical Vapour Deposition−ESTER, for Electrolytic Smelting of Aluminium

• Both have dedicated Main menus and object types

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR

• Now a few words about the FLAIR Special-Purpose version of PHOENICS.

• Some people have asked ‘What is FLAIR?’

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

What is FLAIR?

• FLAIR is a Special-Purpose version of the general CFD code PHOENICS.

• It is aimed at the HVAC community.

• It has been created by removing many unneeded generic features, and adding several specific features.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR Features

• FLAIR uses the PHOENICS VR-Editor to set the problem up, with the following additional items:– ISO 7730 Comfort index calculations: PMV, PPD.– ISO 7730 Draught rating.– CIBSE dry resultant temperature.– Humidity calculations, with output of humidity

ratio and relative humidity.– Smoke movement calculation, with output of PPM,

smoke density and visibility.– Mean age of air calculation.– Fan operating point calculation for single and

multiple fans.– System-curve calculations.

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• In addition, the following object types have been added:– Diffuser

Round

FLAIR Features

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Vortex

FLAIR Features


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Rectangular

FLAIR Features


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Directional

FLAIR Features


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Grille

FLAIR Features


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Displacement

FLAIR Features


PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR Features

• In addition, the following object types have been added:– Diffuser– Fire

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR Features

• In addition, the following object types have been added:– Diffuser– Fire– Person (standingor sitting facing anyDirection)

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR Features

• In addition, the following object types have been added:– Diffuser– Fire– Person – Crowd To represent a large number of people as distributed

source of heat

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR Features

• In addition, the following object types have been added:– Diffuser– Fire– Person – Crowd– SunlightCreated inShapemaker

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

FLAIR Features

• In addition, the following object types have been added:– Diffuser– Fire– Person– Crowd– Sunlight– Spray head

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

• Spray-head represents sprinklers user for fire-suppression.

• It uses GENTRA to model the droplet paths.

• Evaporation is considered, and is linked to the FLAIR humidity model.• The GENTRA inlet table is written

automatically.

FLAIR Features

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Geometry Creation

• We are often asked to create geometry from unusual sources.

• Recently we received a PDF file which contained this image-

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Geometry Creation

• The numbers represent the height of the building

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

Geometry Creation

• The solution was to save the image as a GIF file, then use it as a backdrop in AC3D

• We could trace round each part, then extrude

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006 • The resulting geometry was then

exported to PHOENICS

Geometry Creation

PHOENICS Today

PH

OE

NIC

S U

ser

Mee

tin

g 2

006

phoenics user meeting 2006 phoenics today phoenics 2006 december computer simulation of fluid flow,...

Documents

phoenics user meeting

refined vr editor improvements

slide velocity

user input

cartesian size

assembly object acts

new object type assembly

saved assembly objects