The decarbonisation of the economy is impacting all activities and sectors worldwide. Transport and particularly aircraft are involved in this endeavour; shifting to an H2-powered aircraft is one of the identified options, which implies an effective implementation of the complex cryogenic LH2 storage. Modelling of the tank storage in the shape of a Digital Twin (DTwin) is of paramount relevance in order to facilitate the design process (gains, operating scenarios) and the extrapolation of experimental measurements on a particular set-up to future tanks with other materials or dimensions. The present paper tries to contribute in this sense, presenting the model under development in H2ELIOS project.