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The electroslag remelting process is a remelting process with a consumable electrode. The process produces large ingots of higher quality than the original material by controlled solidification and chemical refinement. Alternating or direct current flows from the solid electrode through the slag layer and the metal pool to the bottom plate. Thereby Joule heat is generated in the molten slag, due to its electrical resistance. The heat is transferred to the electrode and the ingot and is removed via the water cooled mould. The material on the electrode tip is melted. Depending on the melting rate, this material passes through the slag layer, either as a droplet or a jet, and reaches the metal pool. Then the metal solidifies, due to the mould cooling, and forms an ingot with a high grade of directional solidification, depending on the heat balance. A thin solidified slag film develops on the ingot surface during the solidification. This film is responsible for an electrical and thermal insulation between ingot and mould. Furthermore an air gap forms between ingot and mould due to the shrinkage during solidification. There is a primary interest in quantifying the influence of certain process parameters on the structure and the chemical composition of the product. The fluid flow in the slag and in the metal pool has a big influence on macrosegregation and the local solidification time. The fluid flow is driven by buoyancy forces, droplet motion and Lorentz force. Figure 1 Coupling of Multiple Numerical Models to Simulate Electroslag Remelting Process for Alloy 718