This question was already addressed many years ago by the Holy See. In an official statement by Pope John Paul II, the issue of whether a faithful person can receive Holy Communion a second time on the same day was answered affirmatively. However, it was specified that the second reception of Communion must occur during Mass, not simply after Mass or outside of Mass. This is already a norm that the Church has clarified.
Dear visitors of Gloria Dei and all who have already written or who will write a personal message to me. I am grateful for your attention, your kindness, for your spiritual support and especially for your sacrifices and prayers for me. God may reward you!