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Comparing residuals of momentum and energy equation |
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November 25, 2017, 15:12 |
Comparing residuals of momentum and energy equation
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#1 |
New Member
S Karmakar
Join Date: Nov 2017
Location: Kolkata
Posts: 3
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I am actually quite curious to know , when the iteration of residual to attain convergence is carried out, it is often observed the residual for energy equation is much much lower that residual of momentum , x and y component velocity in CONVECTION.
Although if we closely observed the differential equation of momentum i.e Navier-Stokes and of energy is quite analogous considering viscous dissipation in energy equation to be neglected. For my project case where momentum residual reaches in order of 1e-03 , my energy residual is in order of 1e-11. Kindly helped with this query. |
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November 25, 2017, 20:09 |
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#2 |
Senior Member
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Is your process compressible or incompressible ? Is your analysis isothermal or does it have any type of heat flux ? What are the boundary conditions for your problem ?
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November 25, 2017, 22:29 |
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#3 |
New Member
S Karmakar
Join Date: Nov 2017
Location: Kolkata
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Incompressible ideal gas.. constant temperature basebody.. rest part are coupled.
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November 25, 2017, 22:51 |
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#4 |
Senior Member
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What do you mean by coupled? the Energy equation is always coupled to the mometum equation, regardless of the BC. If your problem is isothermal, then you can decoupled (neglect) energy and the solution will be the same since it does not play an important role in the problem, thus the residual is very small. The residual becomes small when the correction is small. Thus, if you have little or no much things affecting energy the residual won't change.
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November 25, 2017, 23:03 |
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#5 | |
New Member
S Karmakar
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