phoenics user meeting 2006 phoenics tomorrow phoenics developments work in progress main activities...
Post on 28-Mar-2015
219 Views
Preview:
TRANSCRIPT
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
PHOENICS DevelopmentsWork in progress
• Main activities are:1. Assisting the new user2. Revealing buried treasures3. Meeting the needs of end-users
in special-application sectors4. Building on existing strengths5. Providing new features
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
1. Assisting the new user;the Commander, 1
-- The PHOENICS-Commander top page has a 'new-user' button;
-- clicking on it leads to: welcome, a quick start, a slower start, tutorials, and ready-to-run cases.
-- But not enough cases have been selected, ‘polished’ and provided with new-user-suitable words.
-- and tutorials need updates and augmentation.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
1. Assisting the new userThe Commander, 2
• The Commander has multi-language structure.
• Each language has its own dictionary and its own help file.
• BUT only the English and Russian are available.
• Who will provide the other-language equivalents?
• It is quite easy for a native speaker. I shall be glad to explain what is necessary.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
2 Revealing buried treasures1 In-Form
• In-Form is an immensely valuable feature of PHOENICS.
• More documentation and exemplification exist for it than for any other feature.
• No competitor has anything so powerful. (Or so I think. Am I right?)
• BUT it has still not ‘caught on’.• Why not? Advice will be welcome.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
2 Revealing buried treasures2. PARSOL
• This cut-cell technique is recognised by most users as economical of users’ time and effort.
• BUT some are persuaded (by competitors ?) that body-fitting grids are inherently more accurate.
• We need benchmark comparisons.• Has anyone made some which they
could/would contribute?
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
2 Revealing buried treasures3. MUSES
• Multiply SharEd Space is a valuable technique, providing multi-phase capability.
• It was introduced into PHOENICS (uniquely, I believe) several years ago; but it became buried.
• It has been used (only) for heat exchangers and blast furnaces .
• Because it employed PLANT statements recovery involved conversion to In-Form.
• Carrying out this conversion has opened the door to NewMuses (discussed below)
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
3 Meeting the needs of end users1 Special-purpose programs
• CHAM has only one well-maintained SPP, namely FLAIR,
• [However, CVD (for chemical-vapour- deposition reactors) and ESTER (for aluminium smelters) have had ‘face-lifts’.]
• The overheads in creating and maintaining an SPP are not small. So there will probably be no more.
• Nevertheless most potential users of PHOENICS are interested in only narrow application sectors.
• We therefore need a new strategy.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
3 Meeting the needs of end users2 Special-purpose GATEWAYS
The ‘new strategy’ the GATEWAY concept, namely
1 The PHOENICS package (pre-processors, solver, post-processors documentation) is always the same.
2. For each sector, there is provided a bundle of files which, accessed via PRELUDE, provide all that the end-user needs but no more.
3.The bundle includes:• A store cupboard filled with useful objects-with-
attributes;• A start-up script;• A few examples;• A new-user tutorial.4. We do not plan to de-activate any parts of PHOENICS; so
a Gateway user still has access to all PHOENICS facilities.5. Probably a modest extra charge will be made for the
files.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
3 Meeting the needs of end users2 GATEWAYS (continued)
• GATEWAYS are much easier to construct and maintain than SPPs.
• They are best constructed by partnerships between CHAM and a specialist company or consultant.
• Examples of application sectors which could be served by PHOENICS GATEWAYS include:
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
3 Meeting the needs of end users2 GATEWAYS (continued)
• Shell-and-tube and other heat exchangers;• Steam condensers;• Furnaces and incinerators;• City pollution; complete-building studies via transfer objects• Circuit-breakers;• Rocket-exhaust plumes;• Fans, pumps, compressors of various kinds;• Wind farms; • Wave tanks;• Waste-water treatment plant;• and many more.
Would you like to be a ‘gateway partner’? Please let me know.
You will learn more about gateways in the last part of this lecture.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
4. Building on existing strengths1. Multi-phase flow
• CHAM pioneered the CFD simulation of two-phase flow, funded by the nuclear industry in the USA and UK.
• The input file library contains many examples.• Competing CFD codes are weaker than PHOENICS in
this application area; but they will catch up.• The (buried) MUSES technique was our first step
towards multi-phase-flow simulation.• The current In-Formization project has revealed:1 (bad) that its PLANT embodiment was not quite
correctly implemented; and2 (good) when it is correctly implemented it allows many
more new applications, and improvements to pre-existing features (e.g.MOFOR), than had been previously recognized.
* Exploitation of this new recognition is one of the tasks being worked on in Moscow.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
4. Building on existing strengths2. Simultaneous flow & solid stress
• Another unique ‘buried-treasure’ strength of PHOENICS is its SFT capability.
• Its early implementation had deficiencies, now removed.
• However exemplification, and problem set-up assistance via VR-Editor or (more probably PRELUDE) must be supplied if its value is to be recognized by users.
• Do any of you have active projects needing simultaneous solid-stress computation? If so, CHAM will be glad to assist.
• Joint consultancy projects would be the best way.
• This is another of the tasks being worked on in Moscow.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
4. Building on existing strengths3. PARSOL
• PARSOL has a weakness, which its name betrays:
• PARt SOLid reveals that its authors thought of cells as having one part fluid and the other solid.
• Then, thinking solids had no need for the pressure or velocity variables, they constructed unsymmetrical coding.
• Since then, we have recognised the need to handle cut cells in which both parts are fluid;
• Or more generally these which may be divided into three, typically (but not necessarily) two fluid parts and one solid.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
4. Building on existing strengths3. PARSOL (continued)
• The current NewParsol project is therefore directed to enabling PHOENICS to handle doubly-cut (and therefore 3-part) cells.
• During its course, the possibility of using Local Body-Fitted-Coordinate grids was explored, and found to be satisfactory for some cases.
• However, human-resource limitations have caused it to be put ‘on hold’.
• Nevertheless, the diversion allowed time and provided stimulus for the invention of a neater NewParsol strategy than was first conceived.
• This is now being investigated. Its implementation will involve both Moscow and Wimbledon.
• A difficulty to be overcome is the ‘Henry-King-ism’ of some the legacy coding. However a ‘cure for this disease’ is being administered.
• The new strategy allows for the stresses to be computed in the solids, as well as heat fluxes both along and normal to the.interfaces.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
5 Providing new featuresUSP 1 the motive
• The only radically new feature being worked on (mainly in Moscow) is UnStructured Phoenics, known as USP.
• The motive is NOT (as it may be for competitors) to handle curved-surface bodies; for PARSOL handles these satisfactorily.
• The motive is to cut out the waste of time and storage entailed by the un-needed fine-grid regions which PARSOL (in a structured grid) generates far from the bodies.
• I will also cut out waste when only a small part of the domain is physically interesting as in the next picture..
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
USP ignores most cells
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
5 Providing new featuresUSP 2 the method
• USP is a part of the standard PHOENICS package, which remains able to work in structured or in USP mode.
• USP employs a standard-PHOENICS cartesian or polar grid as its starting point.
• It proceeds by replacing pairs, quartets or octets of cells by single cells, until the required economical grid is arrived at.
• It retains PARSOL’s sub-cells near curved-surface objects.
• USP employs a collocated scheme for the pressure and velocities.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
5 Providing new featuresUSP 2 the method (continued)
• Most of the new coding is being written in Fortran 90.
• New features are tested as they are introduced, where possible by comparison of results with those of structured PHOENICS.
• Activation of USP requires few actions by the user except settings of grid coarsening factors.
• The main work is being performed in Moscow; but testing has begun in Wimbledon.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
5 Providing new featuresUSP 3. Current status
• All the main elements of USP (unstructured storage, addressing scheme, coefficient and residual calculation, conjugate-gradient solver) exist and work satisfactorily)
• Boundary-condition and source specifications via standard Q1s are accepted.
• Tests are proceeding systematically and successfully.
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
5 Providing new featuresUSP 4. Main outstanding matters
• Acceptance of In-Form input.• Decisions about grid-file format.• Decisions about automatic grid
generation.• Decisions about visual display of
result.• The date for ‘beta’ release
(hopefully June 2007).
PHOENICS Tomorrow
PH
OE
NIC
S U
ser
Mee
tin
g 2
006
Phoenics developments
• Next topic: PRELUDE
top related