Exemplary simulation setup for parallel catheter orientation P with an 8 mm nonirrigated ablation catheter. Ablation catheter and myocardium are completely surrounded by blood. ME2 is in direct contact with the myocardium. In this simulation scenario, the ablation catheter is slightly touching the cardiac tissue. The border zone of ablation lesion is shown by a color gradient. The varying resolution of the tetrahedral grid elements with edge lengths from 0.05 to 0.3 mm can be seen.