a probelem of stress concentration around houle, how can i fix this problem ? and converge in stress ?

model

<img data-media-type="picture" data-position="center" data-size="large" data-media-id="AvG7U9k-QTm0whzzGLkSfQ" style="width: 740px; height: 370px;"><br>stress result<br><img alt="https://gm1.ggpht.com/xjqRVqDxHmnZA4w-A3bXZEN8jrtMK-5esO8rgBaVhiDDP_rxjt5PaWnjZi5igthD4X2-V1URXDA7a6kV5I22lDiYbfnFRi7FL36XHUwSgLW_QimlqknW60V_Wf51BqMoEVGP4F6Ot3fPwNxO1x8UZhEmQgC5L6WoXfPRBmfA_W8OzFlLLymnpUFCseXvcIFW6gGKzYUEWVZqkyQYq8-PWK_xfes5ZhNw9pzl-UFNiV8HAcWb6emH4zn8QMo9xZS1CQnNOEh6I-KFUjhXMrj6fBvvSQNGiK6-SPASUlUH-6SF45qA2Om9IgwNeFQofbKSt-Gq-vmRAqOuz7mT-fNu1gvrjDElk0Q6LYD9uSYm_E4vVGHw32P56WPZRhClXlkioyQM3m70pWGmHC2qnJAHUcr5GCR5ivYXJNFbLqBxJnqpEu6ZYuS4svWseNJvX1gFV6ndxztvSA2_0cZh5d30-ZF8Ct5as1DfbRHr1_ZnDww7GeP7j95aL9aqnpUFfN5f7Vp6oAjWqWmn0vAYBZ06DYYHPeRQstW19dkTvPinil0b7X08SpGRv1XCpXC8IJOD9MV4-ulcG--iLPKFwMBtkPAye5Z2wnbwQSzNbYYIr46Lq43G14bdJ4_-y1oVRHHyrUG1l2qp7jlSp1Ojo8JxrVwENg6nDcV-gIuxl_3zB89K7_1rtDBttswxSwYbEU2_ZzpqcyupQjJb9uMbS7TKF_AK1xy8KuaAMt4T6gxdo_l2G84N_luKASgS0zWs20vzzUo=s0-l75-ft-l75-ft" src=https://3dswym.3dexperience.3ds.com/media?id=AvG7U9k-QTm0whzzGLkSfQ&v=e0125cebc434687b5b0e74fc6fc64c67541fa85dbe5f3936351106711b97ec51 src="https://gm1.ggpht.com/xjqRVqDxHmnZA4w-A3bXZEN8jrtMK-5esO8rgBaVhiDDP_rxjt5PaWnjZi5igthD4X2-V1URXDA7a6kV5I22lDiYbfnFRi7FL36XHUwSgLW_QimlqknW60V_Wf51BqMoEVGP4F6Ot3fPwNxO1x8UZhEmQgC5L6WoXfPRBmfA_W8OzFlLLymnpUFCseXvcIFW6gGKzYUEWVZqkyQYq8-PWK_xfes5ZhNw9pzl-UFNiV8HAcWb6emH4zn8QMo9xZS1CQnNOEh6I-KFUjhXMrj6fBvvSQNGiK6-SPASUlUH-6SF45qA2Om9IgwNeFQofbKSt-Gq-vmRAqOuz7mT-fNu1gvrjDElk0Q6LYD9uSYm_E4vVGHw32P56WPZRhClXlkioyQM3m70pWGmHC2qnJAHUcr5GCR5ivYXJNFbLqBxJnqpEu6ZYuS4svWseNJvX1gFV6ndxztvSA2_0cZh5d30-ZF8Ct5as1DfbRHr1_ZnDww7GeP7j95aL9aqnpUFfN5f7Vp6oAjWqWmn0vAYBZ06DYYHPeRQstW19dkTvPinil0b7X08SpGRv1XCpXC8IJOD9MV4-ulcG--iLPKFwMBtkPAye5Z2wnbwQSzNbYYIr46Lq43G14bdJ4_-y1oVRHHyrUG1l2qp7jlSp1Ojo8JxrVwENg6nDcV-gIuxl_3zB89K7_1rtDBttswxSwYbEU2_ZzpqcyupQjJb9uMbS7TKF_AK1xy8KuaAMt4T6gxdo_l2G84N_luKASgS0zWs20vzzUo=s0-l75-ft-l75-ft">

thank you !