About buoyantPressure in OpenFoam

buoyantPressure Sets fixedGradient pressure based on the atmospheric pressure gradient



How to create new component for TRNSYS 17

the basic is desribed in TRNSYS 17 Manual Volumen 1 Getting Started in 1.8. Creating a new component. The problem is, the tutorial was created for a long time, something changed since the Visual Studio .NET 2003 is not availble. When Visual Studio 2003 was used, the TRNSYS Studio compiles the DLL file directly and save them to the UserLib folder. Now, without Visual Studio 2003, you get a notification, and get two file exported. One .cpp file(C++ source file) and one .dsp(project description for Visual Studio). If you have new generation Visual Studio installed, then open the .dsp file with it, then a new .vcxproj file will be created as project desription file for the new Visual Studio – I use Visual Studio Express 2012. Then build the DLL is quite easy. If TRNSYS.h is not found, copy it form “Trnsys17\Compilers\Cpp-Mvs2003\Include”.

actually I wanna do it with MingW and Code::Blocks, somehow I cannot get it working, I will try later. The .dsp file has some configurations for the compiler and Code::Blocks cannot read it properly, I think. If someone knows how it works, please let me know.

The data structure of Type 56(Multi-zone) in TRNSYS

It looks like if I want to use the Heat Tansfer Coefficient based on the results from OpenFoam, I need modify the .inf file somehow. The Heat Transfer Coefficient depends on the Wall Surface Temperatue and the Air Temperature close to the wall. Usually, the convective heat transfer coefficient of wall is set per wall type either as userdefined or as internal calculation. During the internal calculation, the AirNode temperature is used, which will be replaced by OpenFoam in the Coupling. So, I think we should choose it as userdefined. Under userdefined dialog, we can see 3 options: Constant Value, Input, Schedule. Input should be the right choice, which means the convective heat transfer coefficient of each wall are defined as input for Type56. We can calculate them and save data in an external file. Because of the variation of the Air Temperature in CFD, the Heat Transfer Coefficient could also be variable. That means, for each surface of the geometry, a wall type should be defined according to the air temperature. CHTC

I searched whole day without success, the workflow is to use the heat flux value from OpenFoam for surface energy balance calculation instead of the process of internal calculation with airnode temperature. If Fluent is used, maybe Type 101 is just right for this, but OpenFoam is the tool available to me. I must find another solution to make this happen. I don’t really understand the setting of Wall Gain , is this just means Convective Heat Flux?