## 3 Results and Discussion  
### Results of Simulation  
The body at a temperature of 98 \({}^{\circ}\)C is relatively referred as the \"cold body\" while the body at 150 \({}^{\circ}\)C is referred as the \"hot body\". Pressure distribution around the streamlined hot body is shown in Figure 4. The highest pressure was registered at the front part of the body. The closer to the tail, the lower was the pressure, until it was equal to the pressure of a main volume of liquid. Figure 5 shows the drag force (\(D\)) dependence on the body velocity for air and single-phase water flows (right axis refers to water velocity, left axis--air velocity). Air was taken for comparison purposes only. As air velocity was approaching the supersonic velocity, the drag force was growing more intensively due to the air compression near the body surface. Figure 6 presents the drag coefficient dependence on the body velocity. Numerical modeling was applied for the two cases: body moving in a single-phase liquid (water) and in gas (air). Figure 4: Pressure distribution around the hot streamlined body at 0.5 m/s. Figure 7 indicates the distribution of the overflow velocity for the cold (98 \({}^{\circ}\)C) and hot (150 \({}^{\circ}\)C) bodies. Water flow near the front part and at the tail part of the hot streamlined body was blocked to a lesser extent than in the case of the cold body due to steam formation at the hot body. Consequently, a fluid flow breakaway was observed near the front part and tail of the body. As a result, the drag force was lower for the hot body in comparison to the cold body (Figure 8). Velocity of the liquid phase was the highest at the region where the pressure began to drop (Figure 4). Figure 5: Drag force dependence on the streamlined body velocity. Figure 6: Drag coefficient dependence on the streamlined body velocity. Flow of the liquid slowed down more strongly near the front part of the body in the case of the cold body. The shape of the velocity profile was similar to the shape of a liquid drop on a hydrophilic surface. The shape of the velocity profile near the front part of the hot body, different to the spherical and cylindrical bodies, was also similar to the shape of a liquid drop on a hydrophilic surface like in the case of the cold body. However, despite the similarity of the velocity profiles, flow velocity was higher at the surface of the hot body compared to the cold body. Meanwhile, velocity profile near the tail part of the hot streamlined body was different than in the case of the cold body. The highest velocity was observed near the stabilizer due to presence of the biggest amount of steam at that area. Therefore, the liquid flow was pulled away more intensively at the tail part of the body. In the case of the cold body, the viscosity forces compressed the liquid flow to the whole body and near the tail. All those processes had influence on more intensive stopping of the liquid flow, pressure growth, and drag augmentation of the cold body in comparison to the hot body. In general, it can be noticed that the streamlined body is particular in that it combines features of motion of the spherical and cylindrical bodies. Steam generation on the front part of the hot body and greater amount of steam near the tail part of the body influenced liquid flow breakaway and, consequently, lower drag force (Figure 8). Figure 8 shows drag force distribution for the cold and for hot streamlined bodies. It could be noticed that the area of the cold body surface, influenced by the drag force, was larger than that in the case of the hot body. Total value of the drag force was equal to 0.0125 N for the hot body, and 0.0184 N for the cold body. It is clear that steam formation on the surface of the streamlined body resulted in reduction of the drag force like in the case of the spherical or cylindrical bodies [13]. Table 1 presents the modeling results of the streamlined body.