mirror/monofonIC
1
0
Fork 0
mirror of https://github.com/cosmo-sims/monofonIC.git synced 2024-09-19 17:03:45 +02:00
Code Releases Activity

added test problem (hard coded)

Browse source
This commit is contained in:
Oliver Hahn 2019-07-04 10:17:46 +02:00
parent 45d7c0480c
commit 7a4b65c66a
1 changed files with 29 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
src/ic_generator.cc
View file

@ -53,11 +53,11 @@ int Run( ConfigFile& the_config )
const real_t Dplus0 = the_cosmo_calc->CalcGrowthFactor(astart) / the_cosmo_calc->CalcGrowthFactor(1.0);
const real_t vfac = the_cosmo_calc->CalcVFact(astart);
const double g1 = Dplus0;
const double g1 = -Dplus0;
const double g2 = (LPTorder>1)? -3.0/7.0*Dplus0*Dplus0 : 0.0;
const double g3a = (LPTorder>2)? -1.0/3.0*Dplus0*Dplus0*Dplus0 : 0.0;
const double g3b = (LPTorder>2)? 10.0/21.*Dplus0*Dplus0*Dplus0 : 0.0;
const double g3c = (LPTorder>2)? -1.0/7.0*Dplus0*Dplus0*Dplus0 : (bSymplecticPT)? g1*g2 : 0.0;
const double g3c = (LPTorder>2)? -1.0/7.0*Dplus0*Dplus0*Dplus0 : 0.0;
const double vfac1 = vfac;
const double vfac2 = 2*vfac1;
@ -92,17 +92,20 @@ int Run( ConfigFile& the_config )
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// Fill the grid with a Gaussian white noise field
//--------------------------------------------------------------------
the_random_number_generator->Fill_Grid( phi );
//======================================================================
//... compute 1LPT displacement potential ....
//======================================================================
// phi = - delta / k^2
double wtime = get_wtime();
csoca::ilog << std::setw(40) << std::setfill('.') << std::left << "Computing phi(1) term" << std::flush;
#if 0 // random ICs
//--------------------------------------------------------------------
// Fill the grid with a Gaussian white noise field
//--------------------------------------------------------------------
the_random_number_generator->Fill_Grid( phi );
phi.FourierTransformForward();
phi.apply_function_k_dep([&](auto x, auto k) -> ccomplex_t {
@ -113,6 +116,25 @@ int Run( ConfigFile& the_config )
});
phi.zero_DC_mode();
#else // ICs with a given phi(1) potential function
constexpr real_t twopi{2.0*M_PI};
constexpr real_t epsilon_q1d{0.25};
phi.FourierTransformBackward(false);
phi.apply_function_r_dep([&](auto v, auto r) -> real_t {
real_t q2 = r[0]/boxlen * twopi;
real_t q1 = r[1]/boxlen * twopi;
// std::cerr << q1 << " " << q2 << std::endl;
return (std::cos(q1) + epsilon_q1d * std::cos(q2))/twopi/twopi; ////( std::cos(q1) + epsilon_q1d * std::cos(q2) );// / volfac;
//return -delta / (kmod * kmod) / volfac;
});
phi.FourierTransformForward();
#endif
csoca::ilog << std::setw(20) << std::setfill(' ') << std::right << "took " << get_wtime()-wtime << "s" << std::endl;
//======================================================================