Hi Peter, Hi Freddie, Yes, this is correct; any consistent system of units is valid. However, the scale factors are significant if one has questions such as: 'how big is the cylinder?'
To give a concrete example, the value for viscosity in the .ini file for the cylinder case is 6.07e-05. However, the units are not Pas, since the length scale has been non-dimensionalized by the diameter of the cylinder (d=1 in the .msh file). I guess mass and time have also been scaled since pressure and density are both equal to one. Best regards, Paul. On Monday, 1 February 2016 13:35:53 UTC, Freddie Witherden wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Hi Paul, > > On 01/02/2016 11:52, Paul Garlick wrote: > > A current feature of PyFR is that it can operate in any consistent > > system of units. Would it be possible to add the ability to use a > > specific system of units; SI, for example? > > > > At present, any scale factors used to non-dimensionalize a given > > PyFR case must be recorded separately. The .ini file has no means > > of recording and communicating the factors used. To give an > > example of the kind of question that can arise, one might be > > interested to know the viscosity of the gas used in a previous > > case. To ascertain the answer, it is necessary to have both the > > figure specified in the .ini file and a list of the scale factors. > > > Although the scale factors are indeed required to reverse the > non-dimensionalisation they are not needed if one wishes to make a > comparison with experimental data. All that matters is that the > numerical simulation have dynamic similitude with the experimental data. > > Regards, Freddie. > -----BEGIN PGP SIGNATURE----- > Comment: GPGTools - http://gpgtools.org > > iQIcBAEBCAAGBQJWr184AAoJEJ5wYUFIoPofKrYP/0IuaB1fex+wogMXmpUF2Edh > WtJG05Q64XL9jrKwBSm5vSJ1hz4Vt6qp4sYtDHlGFGucuY1GAtoz+cCfKggRcefV > aNXu2BVmbIxMOF4G0bBkaGL9OJQL1f2btzYnEXTYjvC6MV+veOrt71xooOghwiE8 > Kd3iob6RuWmRYgEh9BlxgFfc8hhMnh3DlirnKz1TWwIF3qpXsPPDSEpPUVR9vLQS > F5mMPmrtzYyNvwHr0itELl5p+M5DxntHTk+EBEIUNVUxi2Z8Ni83SYpV8heUpfOY > q1smNVYDh8NACMuFLBDeJ3fxfV/oMDdbuEyDLyRP8EETMXgXnipfF9HcdVg2Wsiw > Wy0SmJyLFa7hz1/4v0VlHnXIZyMnLMEuWW3FAquzOoU4fxlQjWe4Tp/GoLktXBfm > tZ+acuKdptx8Tio9K9wQAhRf/ZPguGGZyjt3wx9fAE/uA/FcLfO0Kj3l6yKVlQFg > osbn79a23I8eMV5Oy5e2fQjcFgkWiFRaNgUv7rsSaIlsFpZ/uW/M4Wb2/+Hm4g1U > XbYUTfyVf6met/cYhRsENST5lWrr0slMm3xJQtrmmToCUbgNwDFE9hmY+CIdLdGP > Y/BivUOOULs6Pskf/KNXTclMUndAex3oX6EGRCbRKXBZ3pt19iPOmL/WMUjWEv/g > kuCbIuUd7tCZcd8Kxgxr > =rpco > -----END PGP SIGNATURE----- > -- You received this message because you are subscribed to the Google Groups "PyFR Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. Visit this group at https://groups.google.com/group/pyfrmailinglist. For more options, visit https://groups.google.com/d/optout.
