Presentation on theme: "PHOENICS User Meeting 2006 PHOENICS Tomorrow PHOENICS Developments Work in progress Main activities are: 1.Assisting the new user 2.Revealing buried treasures."— Presentation transcript:
PHOENICS User Meeting 2006 PHOENICS Tomorrow PHOENICS Developments Work in progress Main activities are: 1.Assisting the new user 2.Revealing buried treasures 3.Meeting the needs of end-users in special-application sectors 4.Building on existing strengths 5.Providing new features
PHOENICS User Meeting 2006 PHOENICS Tomorrow 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 User Meeting 2006 PHOENICS Tomorrow 1. Assisting the new user The Commander, 2 The Commander has multi-language structure. Each language has its own dictionary and its own help file.dictionary 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 User Meeting 2006 PHOENICS Tomorrow 2 Revealing buried treasures 1 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 User Meeting 2006 PHOENICS Tomorrow 2 Revealing buried treasures 2. 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 User Meeting 2006 PHOENICS Tomorrow 2 Revealing buried treasures 3. 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 User Meeting 2006 PHOENICS Tomorrow 3 Meeting the needs of end users 1 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 User Meeting 2006 PHOENICS Tomorrow 3 Meeting the needs of end users 2 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 User Meeting 2006 PHOENICS Tomorrow 3 Meeting the needs of end users 2 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 User Meeting 2006 PHOENICS Tomorrow 3 Meeting the needs of end users 2 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 User Meeting 2006 PHOENICS Tomorrow 4. Building on existing strengths 1. 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; and 2 (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 User Meeting 2006 PHOENICS Tomorrow 4. Building on existing strengths 2. 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 User Meeting 2006 PHOENICS Tomorrow 4. Building on existing strengths 3. 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 User Meeting 2006 PHOENICS Tomorrow 4. Building on existing strengths 3. 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 User Meeting 2006 PHOENICS Tomorrow 5 Providing new features USP 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 User Meeting 2006 PHOENICS Tomorrow USP ignores most cells
PHOENICS User Meeting 2006 PHOENICS Tomorrow 5 Providing new features USP 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 PARSOLs sub-cells near curved- surface objects. USP employs a collocated scheme for the pressure and velocities.
PHOENICS User Meeting 2006 PHOENICS Tomorrow 5 Providing new features USP 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 User Meeting 2006 PHOENICS Tomorrow 5 Providing new features USP 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 User Meeting 2006 PHOENICS Tomorrow 5 Providing new features USP 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 User Meeting 2006 PHOENICS Tomorrow Phoenics developments Next topic: PRELUDE