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September 16, 2016, 10:33 |
eilmer3: equilibrium air look-up table
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#1 |
New Member
Luigi Loiodice
Join Date: Sep 2016
Posts: 3
Rep Power: 9 |
Hi everybody,
i'm working on Eilmer3 software. I don't understand the meaning of the look-up table about the air in chemical equilibrium, this is a part of the array: -- Auto-generated by build-cea-lut on: 17-Jan-2011 07:52:02 model = 'look-up table' iesteps = 400 irsteps = 50 emin = 143084 de = 142861 lrmin = -6 dlr = 0.16 data = { { {715.346, 715.35, 287.05, 1.40125, 1.36261e-05, 0.0188266}, {715.346, 715.341, 287.059, 1.4012, 1.36261e-05, 0.0188266}, {715.346, 715.342, 287.058, 1.40121, 1.36261e-05, 0.0188266}, {715.346, 715.347, 287.053, 1.40123, 1.36261e-05, 0.0188266}, {715.346, 715.346, 287.054, 1.40122, 1.36261e-05, 0.0188266}, etc.. What does these values refer to? |
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September 18, 2016, 08:15 |
Eilmer 3: equilibrium air look up table
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#2 |
New Member
Join Date: Sep 2010
Posts: 5
Rep Power: 15 |
Hi there,
Are you referring to eilmer3 code from UQ? These numbers I guess like the following: {Temperature, ?, Universal Gas Constant R, (Cp/Cv) Gamma, Viscosity, Density} Not sure about the 2nd term - looks like the first term, with slight changes.. Cheers! Sree. |
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September 19, 2016, 03:55 |
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#3 |
New Member
Luigi Loiodice
Join Date: Sep 2016
Posts: 3
Rep Power: 9 |
Thank you Sree,
yes, eilmer3 code from UQ, I found the source code of the look-up table: #ifndef LOOK_UP_TABLE_HH 13 #define LOOK_UP_TABLE_HH 14 15 #include <string> 16 17 #include "gas_data.hh" 18 #include "gas-model.hh" 19 20 class Look_up_table : public Gas_model { 21 public: 22 Look_up_table(const std::string cfile); 23 ~Look_up_table(); 24 private: 25 int determine_interpolants(const Gas_data &Q, int &ir, int &ie, 26 double &lrfrac, double &efrac); 27 int s_eval_thermo_state_rhoe(Gas_data &Q); 28 int s_eval_transport_coefficients(Gas_data &Q); 29 int s_eval_diffusion_coefficients(Gas_data &Q); 30 double s_molecular_weight(int isp); 31 double s_internal_energy(const Gas_data &Q, int isp); 32 double s_enthalpy(const Gas_data &Q, int isp); 33 double s_entropy(const Gas_data &Q, int isp); 34 double s_dedT_const_v(const Gas_data &Q, int &status); 35 double s_dhdT_const_p(const Gas_data &Q, int &status); 36 double s_gas_constant(const Gas_data &Q, int &status); 37 38 bool with_entropy; 39 double s1_, p1_, T1_; 40 int iesteps_, irsteps_; 41 double emin_, emax_, de_; 42 double lrmin_, lrmax_, dlr_; 43 44 matrix Cv_hat_; 45 matrix Cv_; 46 matrix R_hat_; 47 matrix g_hat_; 48 matrix mu_hat_; 49 matrix k_hat_; 50 matrix Cp_hat_; 51 }; 52 53 Gas_model* create_look_up_table_gas_model(const std::string cfile); 54 55 #endif But I still don't understand the meaning of the first two values of the array and what "_hat_" refers to in the source code Cheers, Luigi |
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