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New Features of PHOENICS 2006

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Computer Simulation of Fluid Flow, Heat Flow, Chemical Reactions ... Grille. FLAIR Features. In addition, the following object types have been added: Diffuser ... – PowerPoint PPT presentation

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Title: New Features of PHOENICS 2006

1
Computer Simulation of Fluid Flow, Heat Flow,
Chemical Reactions and Stress in Solids.
PHOENICS 2006 December
2
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

3
VR Editor Improvements

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.

4
VR Editor Improvements

The default grid can then be easily refined

5
VR Editor Improvements

The treatment of Polar geometries has been
significantly updated.
As a reminder, in polar co-ordinates
X is ?, the angle (in radians!)
Y is r, the radius
Z is z, the axial distance.

6
VR Editor Improvements

For objects using the default 'polcu' geometries,
the size is set in (d?,dr,dz) and position in
(?,r,z) as before.
For non-'polcu' geometries, including STL
imports, the size is in Cartesian (dx,dy,dz),
but position is still in (?,r,z).

7
VR Editor Improvements

As the Cartesian size is used, the shape and size
of the object are preserved with no distortion.

8
VR Editor Improvements

This allows us to use more suitable grids

9
VR Editor Improvements

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

10
VR Editor Improvements
11
VR Editor Improvements

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.

12
VR Editor Improvements

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

13
VR Editor Improvements

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

14
VR Editor Improvements

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.

15
VR Editor Improvements

A new object type TRANSFER has been introduced.

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

16
VR Editor Improvements

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

17
VR Editor Improvements

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.

18
VR Editor Improvements
19
VR Editor Improvements

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.

20
VR Editor Improvements

Components can be added or removed from an
assembly

21
VR Editor Improvements

All size and position changes made to the
assembly object are also applied to all the
components.

22
VR Editor Improvements

All the objects in the assembly can then be
exported to a single file.

23
VR Editor Improvements

The saved assembly objects can then be imported
into another model.

24
VR Editor Improvements

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

25
VR Editor Improvements

The Editor can output the entire geometry in
TECPLOT format.

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

26
VR Editor Improvements

The Editor can also output the entire geometry as
a FieldView unstructured file.

Each object is shown in FieldView as a Boundary.

27
VR Editor Improvements

This is what the Editor makes of it.

28
VR ViewerImprovements

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

29
VR ViewerImprovements
Valve simulation
30
VR ViewerImprovements
31
VR ViewerImprovements

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 .

32
VR ViewerImprovements

The original geometry

33
VR ViewerImprovements

Repeated 9 times

34
VR ViewerImprovements

The contours repeated

35
VR ViewerImprovements

The colour palette can be reversed

36
VR ViewerImprovements

Streamlines can also be repeated

37
VR ViewerImprovements

The sources and sinks for an object can be
displayed

38
VR ViewerImprovements

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
1.0000E00 3.0000E00 6.0000E00 -1.1501E01
8.7500E-01 3.0000E00 6.0000E00 -8.1237E00
8.7500E-01 3.0000E00 6.5000E00 -2.0226E01
1.0000E00 3.0000E00 6.5000E00 -2.1001E01
1.0000E00 3.0000E00 6.5000E00 -2.1001E01
8.7500E-01 3.0000E00 6.5000E00 -2.0226E01
8.7500E-01 3.0000E00 7.0000E00 -3.2328E01
1.0000E00 3.0000E00 7.0000E00 -3.0502E01
39
VR ViewerImprovements

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 1.000000E00 1.583333E00
8.250000E00 -1.893729E01 1.000000E00
1.750000E00 8.250000E00 -1.884477E01
1.000000E00 1.916667E00 8.250000E00
-1.866686E01 1.000000E00 2.083333E00
8.250000E00 -1.838086E01 1.000000E00
2.250000E00 8.250000E00 -1.799543E01
1.000000E00 2.416667E00 8.250000E00
-1.749649E01 1.000000E00 2.583333E00
8.250000E00 -1.690780E01 1.000000E00
2.750000E00 8.250000E00 -1.624763E01
1.000000E00 2.916667E00 8.250000E00
-1.554297E01
40
VR ViewerImprovements

Pressure profile on an aerofoil

41
Earth Improvements

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-e models
via an additional source term.

42
Earth Improvements

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.

43
Earth Improvements

Geometry of standard room fire test
62.9MW steady fire

44
Earth Improvements

Buoyancy constant 0 -gt layered flow

45
Earth Improvements

Buoyancy constant 1 -gt Plume

46
Earth Improvements

Calculated buoyancy constant

47
Earth Improvements

Auto solution is somewhere between plume and
layer!

48
Earth Improvements

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.

49
Earth Improvements

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

50
Earth Improvements

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.

51
Earth Improvements

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

52
VR ViewerImprovements

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

53
General Improvements

A quick-zoom function has been added

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

54
General Improvements

The axes can be unlocked from the domain
origin, and placed anywhere

55
General Improvements

The hand-set icons appear on the tool bar, so the
hand-sets can be turned off

56
General Improvements

The image can be annotated with text strings

57
General Improvements

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!

58
General Improvements

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.

59
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

60
FLAIR

Now a few words about the FLAIR Special-Purpose
version of PHOENICS.
Some people have asked What is FLAIR?

61
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.

62
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.

63
FLAIR Features