## 1 Introduction
Evolving from a MIE harvester system is the EIE harvester, which involves a dual- or multiple-cylinder system. Side-by-side and tandem arrangement VIV harvesters utilize MIE on upstream bodies while downstream bodies experience EIEVIV [20; 21; 22]. It is proven that with optimum gap ratios and position of downstream cylinders the VIV performance significantly improved compared to a single cylinder MIE system. Besides the gap between 2 cylinders, [PERSON] et al. showed that the gap ratio between a rigid wall and 2 cylinders also has a dynamic behavior impact towards vortex induced vibration [24]. Although MIEVIV harvesting system is being widely researched and improved, the disadvantage is that the system is slightly complex and installation area focused in rivers or oceans with consistent flow. A less explored ITEVIV energy harvesting system is an alternative VIV harvester system that is less complex without the need for springs and generators, and more robust in locations to be installed. Usually, an ITEVIV energy harvesting system harnesses the vibration from flow instabilities through a piezoelectric plate. Different orientation and designs of ITEVIV energy harvesting systems have been developed throughout the years to enhance the performance of the system. A few significant examples of these are listed below. [PERSON] et al. tested ITEVIV performance of a single thin Mylar and Acrylic cantilever plate with different mounting angles in which a transverse to flow 90\({}^{\circ}\) installation yields the highest vibration [25]. [PERSON] et al. 's ITEVIV system design is a polypropylene tree leaf design installed with a hinge connecting to the piezoelectric plate aimed at increasing the overall elasticity of the system [26; 27; 28]. As only a single elastic plate or system is present in both [PERSON] et al. and [PERSON] et al. 's IIEVIV energy harvesting models, vortex excitation from flow shedding is only achievable with initial plate deformation or the orientation angle of the plate relative to flow. A large aspect ratio bluff body installed upstream is found to be able to generate flow shedding that excites VIV on the elastic plate. A version of the ITEVIV energy harvesting system had the bluff body installed at the tip of a cantilever plate instead of the base with the purpose of reducing the natural frequency of the model while providing surface width for flow shedding occurrence downstream of the model. [PERSON] et al., [PERSON] et al., [PERSON] et al. and [PERSON] et al. designed and enhanced the ITEVIV harvester [29; 30; 31; 32], [PERSON] et al. doubled the system by combining two cylinders with the piezoelectric harvesters, showing improvement in power produced [33]. This version of ITEVIV energy harvester vibration heavily depends on the movement of the tip mass under the effect of VIV. Additionally, installing a heavy body at the tip of the cantilever plate will induce a mass loading effect and cause damage to the elastic plate after some time. In this research, a base bluff splitter body will generate a vortex frequency that affects the vibration of the attached piezoelectric vibration energy harvesters (PVEH) plate. [PERSON] and [PERSON] were the earliest to use a thin cantilever film with attached (Polyvinylidene fluoride) PVDF membrane placed at a distance behind vortex flow for energy harvesting through ITEVIV [34]. However, A PVDF patch is very dependent on the vibration characteristics of the host cantilever plate where only placing at the nodal point with highest strain is able to produce maximum power output. Implementing the advantages of each design above while improving on the disadvantages, the ITEVIV energy harvester designed in this research is a T-shaped coupled bluff splitter body and PVEH plate model.