# time varying velocity boundary condition

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 August 23, 2017, 03:49 time varying velocity boundary condition #1 Senior Member   Przemek Join Date: Jun 2011 Posts: 187 Rep Power: 8 Hi All, I want to write a BC where in each iteration gradient of U is calculated and applied on the wall. From which type of BC should I start? __________________ best regards pblasiak

 August 25, 2017, 05:55 #2 Member   hannes Join Date: Mar 2013 Posts: 47 Rep Power: 6 Hy Przemek, can't you just use "timeVaringMappedFixedValue"-BC? See for example the pitzDailyExptInlet-tutorial. Regards Hannes

 August 28, 2017, 13:04 #3 Senior Member   Przemek Join Date: Jun 2011 Posts: 187 Rep Power: 8 Hi Hannes, Thank you very much for your respond. timeVaringMappedFixedValue BC seems to be to complicated for me. I am wondering if I can start from fixedValue BC which is basic one. In my casy in each iteration I only need to calculate gradient of velocity and apply it on a wall. Do you think that this BC is appropriate? __________________ best regards pblasiak

 August 29, 2017, 03:50 #4 Member   hannes Join Date: Mar 2013 Posts: 47 Rep Power: 6 Hi Przemek, maybe I don't quite get your intention. How do you want to calculate the gradient? Are you doing that with some other parameters? Then I would try to take one of the BCs from the src/finiteVolume/fields/fvPatchFields/derived/ folder and delete what you don't need (e.g. fixedShearStress). For me it is easier to adapt them instead of the higher level BCs. Regards Hannes

 August 29, 2017, 12:48 #5 Senior Member   Przemek Join Date: Jun 2011 Posts: 187 Rep Power: 8 Hi Hannes, Basically, I have Ubis variable which is a function of some parameters. Ubis is a volVectorField and I calculate it in each iteration. I have to assign to the wall Ubis component which is parallel to the wall. So I have to assign a nonuniform field on the walls and I do not know which type of BC is good for a starting point. __________________ best regards pblasiak

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