Hi, Ashok There is a typing error in your file Conditions_unsteadyConvectionDom.xml in line 56, you type "epsion" there instead of "epsilon", this may be the reason. Ankang -----原始邮件----- 发件人:"ashok jallepalli" <ash.nani@gmail.com> 发送时间:2017-09-03 12:05:25 (星期日) 收件人: nektar-users <nektar-users@imperial.ac.uk>, "<nektar-developers@sci.utah.edu>" <nektar-developers@sci.utah.edu> 抄送: 主题: [Nektar-users] ADRSolver epsilon value defaults to 1.0 Hi All, I am trying to use ADR solver to run unsteady-advection diffusion reaction with epsilon value set to 0.01. But the simulation always defaults to 1.0. I changed epsilon value to 1.0,0.5 0.01. The end result is always the same (as if epsilon=1.0). Please let me know if anyone has encountered this issue or knows how to fix this bug. I have added the script files to reproduce this issue. Cheers, Ashok.