Abstarct: Volcanoes are vents on the surface of the earth from which molten rocks, ash and gases inside the earth erupt. Lava flows are a flow of molten material flowing on the earth's surface that occurs as a result of a volcanic eruption. Although this flow is not permanent, it creates very destructive hazards in the area around volcanoes around the world. To predict and mitigate the consequences of these massive eruptions, scientists use numerical models of lava flow to assess the risk and predict the flow in real time, as well as to assess the effectiveness of various countermeasures. Lavas start to flow after leaving the crater of the volcano, and their flow is mainly gravity flow. During this flow, the lava quickly loses its heat on the surrounding surfaces and starts to harden. On the other hand, at the same time as it passes through and cools down, this flow splits and the lava inside the cooled part comes-out and this cycle of movement and hardening continues until the magma is no longer available in molten form and the so-called flow stops. The important issue in investigating this phenomenon is to be able to predict how far this cycle of movement and hardening continues, or in other words, reach the relationship or relationships that express the equation of movement and temperature change of lavas. The goals of this research can be stated as follows: reaching models for identifying and predicting the way lava flow moves, identifying how the thermal structure of the lava flow changes, investigating the effect of changing the thermal structure of lava on the viscosity of the lava flow, the effect of the type of bedrock of volcanic mountains in the way of flow and change of thermal structure of lava flow. For this purpose, first the independent variables associated with each of the dependent variables are identified, then by using the laws of fluid mechanics and soil mechanics, as well as using mathematical techniques, the prediction models are calibrated and finally, to ensure the accuracy of the resulting model, this model is Real data from an existing volcano has been compared, or rather validated. It is worth mentioning that, in order to achieve the intended goals in this research, Abaqus software has been used.