|
[Sponsors] |
May 13, 2022, 17:00 |
Unit of Parameters in rhoCentralFoam
|
#1 |
New Member
Fuad Hasibul Hasan
Join Date: Feb 2022
Location: Dhaka, Bangladesh
Posts: 7
Rep Power: 4 |
I am trying to modify the $FOAM_TUTORIAL/compressible/rhoCentralFoam/forwardStep of OF-2106. Then I only changed the values of velocity, pressure, temperature, and thermophysical properties to S.I. units. While this tutorial uses normalized gas. Changed the velocity, temperature, pressure from unity to 930 m/s, 873 K and 1.35e7 Pa respectively. The constant/thermoPhysicalProperties file looks like this.
Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: v2106 | | \\ / A nd | Website: www.openfoam.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object thermophysicalProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // thermoType { type hePsiThermo; mixture pureMixture; transport polynomial; thermo hPolynomial; equationOfState PengRobinsonGas; specie specie; energy sensibleEnthalpy; // Note: these are the properties for a "normalised" inviscid gas // for which the speed of sound is 1 m/s at a temperature of 1K // and gamma = 7/5 mixture { specie { molWeight 18; } thermodynamics { CpCoeffs<8> ( 3.91269e4 -1.17335e2 1.2620e-1 4.556e-5 0 0 0 0 ); // Hf 3.59431e06; Sf 6735.18; } transport { muCoeffs<8> ( 1000 -0.05 0.003 0 0 0 0 0 ); // kappaCoeffs<8> ( -1.3719e-5 7.136029e-8 -2.4915e-11 5.6244e-15 0 0 0 0 ); // } equationOfState { Tc 647.27; // critical temp (K) Vc 0.056; // critical volume (m^3/kmol) Pc 22.12e6; //critical pressure (Pa) omega 0.343; // acentric factor (-) } } // ************************************************************************* // This causes either the simulation to diverge or to maximum number of iteration error. Is this problem related to unit of the parameters? I've checked other tutorials for rhoCentralFoam and they use S.I. unit. I am not sure what causes this issue. I tried a lot of solutions provided in this forum but none of them worked. Here is a log file attached for convenience. |
|
Tags |
normalised parameter, normalization, rhocentrafoam, s.i. unit |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Solver parameters to solve convergence issue | WilliamH | SU2 | 5 | February 5, 2021 07:19 |
Pro/E to ANSYS Parameterization Guide | Trues | ANSYS | 4 | April 18, 2018 06:52 |
Grid I Unit Normal and Grid J Unit Normal | pawansut | Tecplot | 4 | July 31, 2017 19:14 |
how to caculate the mass of impacting particles per unit area and per unit time? | xyq916 | CFX | 0 | October 8, 2015 09:55 |
Parameters rhoSimpleFoam | marcus85 | OpenFOAM Pre-Processing | 0 | May 15, 2013 10:36 |