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April 21, 2009, 03:18 |
steady state evaluation!
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#1 |
New Member
sean strand
Join Date: Apr 2009
Posts: 2
Rep Power: 0 |
Dear memebrs;
I always appreciate your valuable comments and ideas. Now I try to simulate heating panel embedded water pipe. except one surface, all faces are adiabatic conditions. at the surface, heating load is placed on the boundary(about -500W) water is supplied at 35C. From the first law, water outlet temperature will be around 25C when the water mass flow is set at 0.0138 kg/s. I want to know the surface temperature and water outlet temperature thourgh S/S condition in CFX. If the panel set 15C then water is start to circulate, should I set the initial condition of the panel(solid) at 15C or expected temperature (around 27C)? I mean the panel surface temperature will be around 27C (I expected) after water is fully circulated. What is a suitable option for time scale control? (autotime scale or physical time scale factor) Whenever I changed the time scale control (Auto -aggressive, conservative) and initial condition of solid and fluid(water), output is very different. I'm not sure what is reasonable data. please let me know the best shot! regards! |
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April 21, 2009, 05:18 |
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#2 |
Senior Member
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Hi,
The temperature of the surface will reach a balanced one once your steady state solution converged. So just set a heat flux for this surface since -500W is given. Regarding the timescale, just follow the Advice on Flow Modelling on Timestep Selection. Do all of the models of different timescale settings have converged ? If not, it is normal to differ greatly. |
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