High-quality tetrahedral grids are generated using pointwise V16.04 (Pointwise, Inc.) both for an idealized constant diameter IVC conduit and for reconstructed conduit geometries. The inlet and the outlet of conduits are extended by 5*D* and 10*D*, respectively. For validation simulations, the fully developed flow over ideal constant diameter IVC geometry is employed. Grid dependence test is carried out for three meshes with different element sizes. The computed pressure drop values obtained for those meshes are compared with analytical results calculated using the Hagen–Poiseuille equation; errors are calculated as 2.3%, 0.6%, and 0.3% for 346,233, 568,471, and 1,278,264 elements, respectively. The solver is also validated for correct entrance length prediction. Mesh verification study is also repeated for the most deformed TCPC conduit case by generating different grids (4,576,442, 2,491,254, 1,911,108, 1,233,371, and 762,240 elements). Pressure drops and velocity profiles at these meshes are compared with the finest mesh. Mesh with 1,911,108 elements is chosen as the baseline for all conduit geometries and mesh density is kept constant for all other geometries. For validation, pressure drop of PTFE conduit with 0.5*D* offset, 0 deg twist angle, and under 9 mmHg pressure from our simulation is compared with Fontan conduit pressure drops (IVC section only) from the literature [20] and the results are found to be of the same order.