|
[Sponsors] |
wallHeatTransferCoeff + simpleFOAM ( OpenFoam7) |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
September 21, 2020, 05:15 |
wallHeatTransferCoeff + simpleFOAM ( OpenFoam7)
|
#1 |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 8 |
Hi All,
I think open a specific topic is more appropiate. I want to calculate the heat transfer coefficient (called "virtual htc" as in star ccm +) after a steady state incompressible solver (simpleFoam). The simulation is about water in a cooling pipe. I don't need energy equation so i decided to use simpleFoam. Infact the flow is steady and the cooling medium is water... I have verified that wallHeatTransferCoeff function object is available for simpleFoam in openFOAM7. This is the formula used in wallHeatTransferCoeff.C to calculate the heat transfer coefficient PHP Code:
PHP Code:
No errors occours, neither warnings during the simulation..I use KEpsilon model for turbulence, inlet mass flow rate and fixed value for pressure at outlet. Flow velocity is about 3 m/s Why when I visualize the results in paraview about the wallHeatTransferCoeff I obtain value from 1*10^0 to 6*10^0 and not in the order of 10^4 ?? they seems not to be in w/m^2k ... |
|
September 21, 2020, 08:10 |
|
#2 |
Senior Member
Join Date: Oct 2017
Posts: 121
Rep Power: 8 |
Never used it myself, but I think the unit is W/(m*K).
wallHeatTransferCoeff.C Code:
tmp<volScalarField> twallHeatTransferCoeff ( volScalarField::New ( type(), mesh_, dimensionedScalar ( dimMass/pow3(dimTime)/(dimTemperature/dimLength), 0 ) ) ); Last edited by Krapf; September 21, 2020 at 17:05. |
|
September 21, 2020, 10:06 |
|
#3 |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 8 |
yes .. but why I obtain such different results between star CCM + and openfoam? Velocity and pressure gradient is failry the same in the two simulation!
|
|
September 21, 2020, 17:03 |
|
#4 |
Senior Member
Join Date: Oct 2017
Posts: 121
Rep Power: 8 |
Is the heat transfer coefficient in STAR-CCM+ calculated using the same or a similar equation? Or is it given there in W/(m^2*K)?
|
|
September 22, 2020, 06:08 |
|
#5 |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 8 |
you are right... I did not notice that.. so stupid.
Star CCM + reports value in W/m^2K while openFOAM in W/mk also formulations are quite different. beside this, I'm much more confused because I' m not familiar with openFOAM local heat transfer formulation.. anyone has developed his localHTC post process utility similar to the Star ccm + one? |
|
September 23, 2020, 05:05 |
|
#6 |
Senior Member
Join Date: Oct 2017
Posts: 121
Rep Power: 8 |
Take a look here: Heat Transfer Coefficients from WallHeatFlux
Does this help you? EDIT: Probably not, because due to simpleFoam you don't have a wall temperature. |
|
September 23, 2020, 08:56 |
|
#7 | |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 8 |
Quote:
I have to implement a different local hct calculation similar to the one of star ccm+.. |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
simpleFoam tutorial PitzDaily using Reynolds stress tensor (LRR RASModel) | dlahaye | OpenFOAM Running, Solving & CFD | 24 | August 4, 2023 14:29 |
interFoam vs. simpleFoam channel flow comparison | DanM | OpenFOAM Running, Solving & CFD | 12 | January 31, 2020 15:26 |
simpleFoam parallel solver & Fluent polyhedral mesh | Zlatko | OpenFOAM Running, Solving & CFD | 3 | September 26, 2014 06:53 |
Laminar simpleFoam and inviscid simpleFoam | herenger | OpenFOAM Running, Solving & CFD | 7 | July 11, 2013 06:27 |
Trying to run a benchmark case with simpleFoam | spsb | OpenFOAM | 3 | February 24, 2012 09:07 |